Information processing system, information processing method, and readable medium

ABSTRACT

An information processing system includes a processor, and the processor acquires a vehicle driving environment composed of N-dimensional parameters, refers to an ideal driving driver model indicating an ideal driving environment region in an N-dimensional coordinate system, and selects one ideal driving environment included in the ideal driving environment region based on a distance between the ideal driving environment region and the acquired vehicle driving environment in the N-dimensional coordinate system.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of the PCT International Application No. PCT/JP2017/037785 filed on Oct. 19, 2017, which claims the benefit of foreign priority of Japanese patent application No. 2016-209671 filed on Oct. 26, 2016, the contents all of which are incorporated herein by reference.

TECHNICAL FIELD

The present invention relates to an information processing system, an information processing method, and a program for processing information pertaining to a vehicle.

BACKGROUND ART

Recently, there have been proposed various technologies relating to a vehicle which can be driven in a manual driving mode in which a driver oneself drives the vehicle or in an autonomous driving mode in which a portion of or all of driving operations are autonomously performed, or technologies relating to a fully automated self-driving vehicle, based on a surrounding situation of the vehicle or a travel state (for example, the speed of the vehicle or control information such as steering, acceleration, braking, turn signal indicator, or actuator the vehicle, and these technologies have been put into practical use.

For example, PTL 1 discloses a travel control device configured to, when performing, on a host vehicle, autonomous steering control or autonomous acceleration/deceleration control, allow a driver to visually recognize the operating state of the autonomous steering control or the autonomous acceleration/deceleration control.

CITATION LIST Patent Literature

-   PTL 1: Unexamined Japanese Patent Publication No. 2005-67483

SUMMARY OF THE INVENTION

The present invention provides an information processing system that enables a driver to perform ideal driving.

An information processing system according to one aspect of the present invention is an information processing system provided with at least one processor. The at least one processor in the information processing system acquires a vehicle driving environment composed of N-dimensional (N is an integer of 2 or greater) parameters, refers to an ideal driving driver model indicating an ideal driving environment region in the N-dimensional coordinate system, and selects one ideal driving environment included in the ideal driving environment region based on a distance between the ideal driving environment region and the acquired vehicle driving environment in the N-dimensional coordinate system. For example, the at least one processor displays, on a display, recommendation information for bringing the vehicle driving environment closer to the selected ideal driving environment. Specifically, the N-dimensional parameters include at least one of a vehicle speed, a steering angle, an inter-vehicular distance, and a relative speed, as a parameter.

Thus, as will be described in a sixth exemplary embodiment, for example, the recommendation information for bringing the vehicle driving environment closer to the ideal driving environment is displayed on the display, whereby a driver can easily perform ideal driving using the recommendation information.

Further, when selecting the ideal driving environment, the at least one processor may select an ideal driving environment having the shortest distance with the vehicle driving environment from the ideal driving environment region.

Thus, as will be described in the sixth exemplary embodiment, for example, the driver can bring the current vehicle driving environment closer to the ideal driving environment with an amount of change from the current vehicle driving environment being reduced, and therefore, can perform ideal driving more easily.

Further, when displaying the recommendation information, the at least one processor may determine, as the recommendation information, information for recommending that the driver of the vehicle changes a driving operation amount which is at least one of a steering angle and a depression amount of a brake or an accelerator. For example, the at least one processor may further calculate a difference between the vehicle driving environment and the selected ideal driving environment, and when displaying the recommendation information, may specify the driving operation amount for reducing the difference and determine the recommendation information indicating the current driving operation amount and the specified driving operation amount.

Thus, as will be described in the sixth exemplary embodiment, the driver can easily find, based on the recommendation information, how to change at least one of the steering angle and the depression amount of the accelerator and the brake for achieving ideal driving.

Further, the at least one processor may also refer to a plurality of the ideal driving driver models indicating ideal driving environment regions that are different from one another in the N-dimensional coordinate system, and display, on the display, a plurality of the ideal driving environment regions that are different from one another and a point indicating the driving environment of the vehicle.

Thus, as will be described in a modification of the sixth exemplary embodiment, the driver can easily find how to change the parameters such as the steering angle and vehicle speed for bringing the current driving environment closer to any types of ideal driving environment.

Further, when the abovementioned point is located within any one of a plurality of the ideal driving environment regions, the at last one processor may display, on the display an icon indicating that the vehicle driving environment is the ideal driving environment corresponding to the region.

Thus, as will be described in the modification of the sixth exemplary embodiment, the driver can easily find what type of ideal driving he/she performs.

Further, the at least one processor may model, based on a degree of similarity between driving behavior histories of a plurality of model drivers and a driving behavior history of a driver driving the vehicle, driving behavior histories of at least one or more model drivers from among the driving behavior histories of the plurality of model drivers, construct an ideal behavior driver model indicating a relationship between behaviors of vehicles driven the at least one or more model drivers and a travel environment, and estimate a behavior associated with the travel environment of the vehicle driven by the driver in the constructed ideal behavior driver model as a behavior of the vehicle.

With this configuration, as will be described in a second modification of fourth and fifth exemplary embodiments, an ideal behavior for the driver of the vehicle is estimated, and due to presentation of the ideal behavior, the driver can select the ideal driving.

The at least one processor may perform the above processes by executing a program recorded on a non-transitory computer-readable recording medium such as a read only memory (ROM) or a random access memory (RAM).

Note that those comprehensive or specific aspects may be implemented by a system, a method, an integrated circuit, a computer program, or a recording medium such as a computer readable CD-ROM, or may be implemented by any combination of the system, the method, the integrated circuit, the computer program, and the recording medium.

According to the present invention, the driver can perform ideal driving.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a block diagram illustrating a configuration of a man part of a vehicle including an information notification device according to a first exemplary embodiment of the present invention.

FIG. 2 is a view for describing a first example of a travel environment, a display on a notification unit for the first example of the travel environment, and an operation to an operating unit.

FIG. 3 is a view illustrating another example of a display the notification unit.

FIG. 4 is a flowchart illustrating a procedure of an information notification process according to the first exemplary embodiment of the present invention.

FIG. 5 is a view illustrating a first example of a travel environment, and display control for the first example of the travel environment.

FIG. 6 is a view illustrating the first example of a travel environment, and another display control for the first example of the travel environment.

FIG. 7 is a view illustrating a second example of the travel environment, and display control for the second example of the travel environment.

FIG. 8 is a view illustrating a third example of the travel environment, and display control for the third example of the travel environment.

FIG. 9 is a view illustrating a fourth example of the travel environment, and display control for the fourth example of the travel environment.

FIG. 10 is a view illustrating a fifth example of the travel environment, and display control for the fifth example of the travel environment.

FIG. 11 is a view illustrating another display control for the first example of the travel environment illustrated in FIG. 5.

FIG. 12 is a view illustrating another display control for the second example of the travel environment illustrated in FIG. 7.

FIG. 13 is a block diagram illustrating a configuration of a main part of a vehicle including an information notification device according to a second exemplary embodiment of the present invention.

FIG. 14 is a view for describing a display on a touch panel in the second exemplary embodiment.

FIG. 15 is a view for describing a display on a notification unit according to a third exemplary embodiment of the present invention.

FIG. 16 is a diagram showing one example of a travel history.

FIG. 17 is a diagram showing a method for constructing a clustering-type driver model.

FIG. 18 is a diagram showing one example of the constructed clustering-type driver model.

FIG. 19 is a diagram showing another example of the constructed clustering-type driver model.

FIG. 20 is a diagram showing a method for constructing an individually-adapted-type driver model.

FIG. 21 is a diagram showing one example of the constructed individually-adapted-type driver model.

FIG. 22 is a diagram showing one example of a driving characteristic model.

FIG. 23 is a view for describing a display on a notification unit according to a fourth exemplary embodiment of the present invention.

FIG. 24 is a view for describing a display on the notification unit according to the fourth exemplary embodiment of the present invention.

FIG. 25 is a view for describing a display on the notification unit according to the fourth exemplary embodiment of the present invention.

FIG. 26 is a view for describing a display on the notification unit according to the fourth exemplary embodiment of the present invention.

FIG. 27 is a diagram showing one example of a travel history.

FIG. 28 is a diagram showing a method for using a driver model according to a modification of the present invention.

FIG. 29 is a block diagram showing one example of a cache arrangement in the modification.

FIG. 30 is a diagram showing one example of a method for generating a cache in the modification.

FIG. 31 is a diagram showing one example of the method for generating a cache in the modification.

FIG. 32 is a block diagram illustrating a configuration of a main part for estimating a vehicle speed, an inter-vehicular distance, and an acceleration rate according to a fifth exemplary embodiment.

FIG. 33 is a diagram showing a timing at which a vehicle speed and an environmental parameter are collected in the fifth exemplary embodiment.

FIG. 34 is a diagram showing a timing at which an inter-vehicular distance and an environmental parameter are collected in a fifth exemplary embodiment.

FIG. 35 is a diagram showing a timing at which an acceleration rate and an environmental parameter are collected in the fifth exemplary embodiment.

FIG. 36 is a diagram showing an example of an acceleration rate pattern in the fifth exemplary embodiment.

FIG. 37 is a diagram showing one example of information stored in a storage unit in the fifth exemplary embodiment.

FIG. 38 is a diagram showing another example of the information stored in the storage unit in the fifth exemplary embodiment.

FIG. 39 is a diagram illustrating a configuration of an information processing system according to the fourth and fifth exemplary embodiments.

FIG. 40 is a diagram showing an example of a steering angle pattern in the information processing system according to the fourth and fifth exemplary embodiments.

FIG. 41 is a diagram showing a timing at which a steering angle and an environmental parameter are collected in the information processing system according to the fourth and fifth exemplary embodiments.

FIG. 42 is a diagram illustrating a configuration of an information processing system for constructing a vehicle characteristic model according to the fourth and fifth exemplary embodiments.

FIG. 43 is a diagram showing a vehicle characteristic in the fourth and fifth exemplary embodiments.

FIG. 44 is a flowchart showing an information processing method according to the fourth and fifth exemplary embodiments.

FIG. 45 is a diagram illustrating a configuration of an information processing system according to a first modification of the fourth and fifth exemplary embodiments.

FIG. 46 is a diagram showing one example of a dangerous travel history stored in a dangerous travel history storage unit in an information processing system according to the first modification of the fourth and fifth exemplary embodiments.

FIG. 47 is a diagram illustrating a configuration of an information processing system according to a second modification of the fourth and fifth exemplary embodiments.

FIG. 48 is a diagram showing one example of a model driving behavior history stored in a model driving behavior history storage unit according to the second modification of the fourth and fifth exemplary embodiments.

FIG. 49 is a block diagram illustrating one example of a configuration of an information processing system according to a sixth exemplary embodiment.

FIG. 50 is a diagram showing one example of content of a model driving environment database stored in a model driving storage unit in the sixth exemplary embodiment.

FIG. 51 is a diagram showing one example of a relationship between an ideal driving environment region and a vehicle driving environment in the sixth exemplary embodiment.

FIG. 52 is a view showing an example of recommendation information to be displayed on a display unit in the sixth exemplary embodiment.

FIG. 53 is a flowchart showing an example of an information processing method according to the sixth exemplary embodiment.

FIG. 54 is a view illustrating an example of an image to be displayed on a display unit in a modification of the sixth exemplary embodiment.

FIG. 55 is a view illustrating another example of the image to be displayed on the display unit in the modification of the sixth exemplary embodiment.

DESCRIPTION OF EMBODIMENTS

Prior to describing exemplary embodiments of the present invention, problems formed in a conventional device will be described briefly. The travel control device (that is, information processing system) disclosed in PTL 1 has a problem that it is difficult for a driver to perform ideal driving.

Hereinafter, the exemplary embodiments of the present invention will be described in detail with reference to the drawings. The first to third exemplary embodiments describe an information notification device, an information notification method, or an information notification program with which it is possible to appropriately transmit information so as to enable comfortable autonomous driving in which a vehicle operation and a driver's operation are difficult to be incompatible with each other. The fourth and fifth exemplary embodiments describe an information processing system, an information processing method, and a program with which it is possible to estimate a driving behavior suitable for a driver. The sixth exemplary embodiment describes an information processing system, an information processing method, and a program for providing recommendation for bringing driving of a vehicle by a driver closer to ideal driving.

Note that each of the exemplary embodiments described below is only illustrative, and does not limit the present invention. Specifically, the following exemplary embodiments provide comprehensive or specific examples of the present invention. Numerical values, shapes, materials, constituent elements, arrangement positions and connection modes of the constituent elements, steps, and order of the steps, for example, illustrated in the following exemplary embodiments are merely examples, and therefore are not intended to limit the present invention. Further, among the constituent elements in the following exemplary embodiments, the constituent elements not recited in the independent claim indicating the broadest concept are described as optional constituent elements.

It should be noted that each of the diagrams is schematic, and is not necessarily illustrated precisely. Further, in each diagram, the same components are denoted by the same reference marks.

First Exemplary Embodiment

FIG. 1 is a block diagram illustrating a configuration of a main art of vehicle 1 including an information notification device according to the first exemplary embodiment of the present invention. Vehicle 1 enables all of or a portion of driving control autonomously without requiring an operation performed by a driver.

Vehicle 1 includes brake pedal 2, accelerator pedal 3, indicator lever 4, steering wheel 5, detector 6, vehicle controller 7, storage unit 8, and information notification device 9.

Brake pedal 2 receives a brake operation performed by the driver to decelerate vehicle 1. Brake pedal 2 may also receive a result of control performed by vehicle controller 7, and vary in an amount corresponding to the degree of deceleration of vehicle 1. Accelerator pedal 3 receives an acceleration operation performed by the driver to accelerate vehicle 1. Accelerator pedal 3 may also receive a result of control performed by vehicle controller 7, and vary in an amount corresponding to the degree of acceleration of vehicle 1. Indicator lever 4 receives a lever operation performed by the driver to turn on an unillustrated turn indicator of vehicle 1. Indicator lever 4 may also receive a result of control performed by vehicle controller 7 to bring indicator lever 4 into a state corresponding to the indicated direction of vehicle 1 and turn on the unillustrated turn indicator of vehicle 1.

Steering wheel 5 receives a steering operation performed by the driver to change the travel direction of vehicle 1. Steering wheel 5 may also receive a result of control performed by vehicle controller 7 and vary in an amount corresponding to the change in the travel direction of vehicle 1. Steering wheel 5 includes operating unit 51.

Operating unit 51 is provided on a front face (face facing the driver) of steering wheel 5, and receives an input operation from the driver. Operating unit 51 is a device such as a button, a touch panel or a grip sensor, for example. Operating unit 51 outputs the information about the input operation received from the driver to vehicle controller 7.

Detector 6 detects a travel state of vehicle 1 and a surrounding situation of vehicle 1. Then, detector 6 outputs information about the detected travel state and the detected surrounding situation to vehicle controller 7.

Detector 6 includes location information acquisition unit 61, sensor 62, speed information acquisition unit 63, and map information acquisition unit 64.

Location information acquisition unit 61 acquires, as the information about the travel state, information about the location of vehicle 1 by a global positioning system (GPS) or the like.

Sensor 62 detects the surrounding situation of vehicle 1. Specifically, sensor 62 detects the location of a nearby vehicle present around vehicle 1 and whether this vehicle is a preceding vehicle or not based on information about the location of this vehicle and lane position information, detects a time to collision (TTC) based on the speed of the nearby vehicle and the speed of vehicle 1, and detects an obstacle present around vehicle 1.

Speed information acquisition unit 63 acquires, as information about the travel state, information about the speed or the travel direction of vehicle 1 by an unillustrated speed sensor or the like.

Map information acquisition unit 64 acquires, as information about the surrounding situation of vehicle 1, map information around vehicle 1 such as the road on which vehicle 1 is traveling, a merging point with the nearby vehicle on the road, the lane in which vehicle 1 is currently traveling, a position of an intersection, or the like.

Note that sensor 62 is composed of a millimeter-wave radar, a laser radar, a camera, or a combination thereof.

Storage unit 8 is a storage device such as a read only memory (ROM), random access memory (RAM), a hard disk drive, or a solid state drive (SSD), and stores a correspondence between the travel environment at present and a candidate of a behavior that can be performed next (after a lapse of a first predetermined time).

The travel environment at present is an environment determined based on the location of vehicle 1, the road on which vehicle 1 is traveling, and the location and speed of the nearby vehicle present around vehicle 1, for example. Notably, for example, whether vehicle 1 is now accelerating or decelerating, and in addition, even a possibility of collision with the nearby vehicle after one second because of the nearby vehicle cutting in front of vehicle 1 may also be determined, according to the location or speed of the nearby vehicle, based on not only momentary data but also data before and after the moment. Thus, the movement of the nearby vehicle can be predicted, whereby the travel environment can be recognized in more detail with higher accuracy. The behavior candidate is a candidate of a behavior that can be performed next by vehicle 1 (after a lapse of the first predetermined time) in response to the travel environment at present.

For example, storage unit 8 stores in advance three behavior candidates which are acceleration of vehicle 1, deceleration of vehicle 1, and lane change of vehicle 1 to the right, in association with a travel environment in which there is a merging lane ahead in the lane in which vehicle 1 is traveling, there is a vehicle merging from the left side of the lane, and it is possible to change lanes to the right relative to the lane which vehicle 1 is traveling.

Storage unit 8 also stores in advance, in association with a travel environment in which a vehicle traveling in front of vehicle 1 in the same lane of vehicle 1 (such a vehicle will be hereinafter referred to as a “preceding vehicle”) is traveling with the speed lower than the speed of vehicle 1, and it is possible to change the lane to the adjacent lane, three behavior candidates which are a travel mode for overtaking the preceding vehicle, a travel mode for changing the lane to the adjacent lane, and a travel mode for decelerating vehicle 1 to follow the preceding vehicle.

In addition, storage unit 8 may store the priority order of each of the behavior candidates. For example, storage unit 8 may store the number of times each behavior has been actually selected for the same previous travel environment, and may store the priority order such that the most frequently selected behavior has a higher priority order.

Vehicle controller 7 can be implemented as a part of a large scale integration (LSI) circuit or an electronic control unit (ECU) controlling the vehicle, for example. Vehicle controller 7 controls the vehicle based on information about the travel state and the surrounding situation acquired from detector 6, and controls brake pedal 2, accelerator pedal 3, indicator lever 4, and information notification device 9 according to the result of the vehicle control. Note that the target to be controlled by vehicle controller 7 is not limited to those described above.

Firstly, vehicle controller 7 determines the travel environment at present based on the information about the travel state and the surrounding g situation. Conventionally proposed various methods can be used for this determination.

For example, vehicle controller 7 determines the travel environment at present to be “a travel environment in which there is a merging lane ahead in the lane in which vehicle 1 is traveling, there is a vehicle merging from the left side of the lane, and it is possible to change the lane to the right relative to the lane in which vehicle 1 is traveling”, based on the information about the travel state and the surrounding situation.

Further, vehicle controller 7 determines, for example, that the time sequence of the travel environment is a “travel environment in which a vehicle traveling in front of vehicle 1 in the same lane of vehicle 1 is traveling with the speed lower than the speed of vehicle 1, and it is possible to change the lane to the adjacent lane”, based on the information about the travel state and the surrounding situation.

Vehicle controller 7 causes notification unit 92 of information notification device 9 to provide notification regarding information pertaining to the travel environment indicating the travel state and the surrounding situation. Vehicle controller 7 also reads, from storage unit 8, behavior candidates that can be performed next by vehicle 1 (after a lapse of the first predetermined time) in response to the determined travel environment.

Vehicle controller 7 determines which is the most suitable for the current travel environment from among the read behavior candidates, and sets the behavior most suitable for the current travel environment as a first behavior. Notably, the first behavior may be the same as the behavior the vehicle 1 is currently doing, that is, vehicle 1 may continue the current behavior. Then, vehicle controller 7 sets, as a second behavior (different from the behavior to be performed), behavior candidates executable by the driver other than the first behavior in the current travel environment.

For example, vehicle controller 7 may set the most suitable behavior as the first behavior using a conventional technology for determining the most suitable behavior based on the information about the travel state and the surrounding situation.

Alternatively, vehicle controller s relay set, from among a plurality of behavior candidates, a predefined behavior as the most suitable, behavior, or vehicle controller 7 may store in storage unit 8 the information about the last selected behavior, and determine this behavior as the most suitable behavior. Alternatively, vehicle controller 7 may store in storage unit 8 the number of times each behavior has been previously selected, and determine the most frequently selected behavior as the most suitable behavior.

Then, vehicle controller 7 causes notification unit 92 of information notification device 9 to provide notification regarding the information about the first behavior and the second behavior. Note that, when determining that there is no second behavior, vehicle controller 7 causes notification unit 92 to provide notification regarding only the first behavior.

It is to be noted that vehicle controller 7 may cause notification unit 92 to simultaneously provide notifications regarding the information about the first behavior and the second behavior and the information about the travel state and the surrounding situation.

In addition, vehicle controller 7 acquires information about the operation received by operating unit 51 from the driver.

Vehicle controller 7 determines whether or not operating unit 51 has received an operation within a second predetermined time after the notification regarding the first behavior and the second behavior. This operation corresponds to an operation for selecting one of behaviors included the second behavior, for example.

When operating unit 51 has not received an operation within the second predetermined time, vehicle controller 7 controls the vehicle such that the vehicle executes the first behavior, and controls brake pedal 2, accelerator pedal 3, and indicator lever 4 according to the result of the vehicle control.

When operating unit 51 has received an operation within the second predetermined time, vehicle controller 7 performs the control corresponding to the received operation.

Information notification device 9 acquires various types of information regarding the traveling of vehicle 1 from vehicle controller 7, and provides notification regarding the acquired information. Information notification device 9 includes information acquisition unit 91 and notification unit 92.

Information acquisition unit 91 acquires various types of information regarding the traveling of vehicle 1 from vehicle controller 7. For example, when determining that vehicle controller 7 may update the behavior of vehicle 1, information acquisition unit 91 acquires the information about the first behavior and the information about the second behavior from vehicle controller 7.

Then, information acquisition unit 91 temporarily stores the acquired information in an unillustrated storage unit, and reads the stored information from the storage unit and outputs the read information to notification unit 92 as needed.

Notification unit notifies the driver of the information regarding traveling of vehicle 1. Notification unit 92 may be a display unit for displaying information, including a light emitting element such as a light emitting diode (LED) provided for example, a car navigation system, a head-up display, a center display, steering wheel 5, and a pillar installed in the vehicle; a speaker for notifying the driver of information by converting the information into a sound; or a vibrator provided on a position (for example, a seat for the driver, steering wheel 5, and the like) where the driver can sense the vibration. Alternatively, a combination of these components is also applicable as notification unit 92.

In the following description, notification unit 92 is described as display device.

In this case, notification unit 92 is a head up display (HUD), a liquid crystal display (LCD), a head-mounted display or a helmet-mounted display (HMD), smart glasses, and other exclusive displays. The HUD may be a windshield of vehicle 1, or a glass surface or a plastic surface (for example, combiner) separately provided, for example. The windshield may be a front windscreen, or a side windscreen or a rear windscreen of vehicle 1, for example.

In addition, the HUD may be a transmission display provided on the surface or the inside of the windshield. Herein, the transmission display is a transmission organic electroluminescence (EL) display or a transparent display using glass that emits light when being irradiated with light of a specific wavelength. The driver can visually recognize the display on the transmission display while viewing a background. As described above, notification unit 92 may be a display medium that transmits light. In any case, an image is displayed on notification unit 92.

Notification unit 92 notifies the driver of the information regarding the traveling acquired from vehicle controller 7 through information acquisition unit 91. For example, notification unit 92 notifies the driver of the information about the first behavior and the second behavior acquired from vehicle controller 7.

Hereinafter, a specific display content and an operation performed on operating unit 51 will be described.

FIG. 2 is a view for describing a first example of a travel environment, a display on notification unit 92 for the first example, a an operation to operating unit 51.

Part (a) of FIG. 2 is an overhead view illustrating the travel environment of vehicle 1. Specifically, part (a) of FIG. 2 illustrates a travel environment in which there is a merging lane ahead in the lane in which vehicle 1 is traveling, there is a vehicle merging from the left side of the lane, and it is possible to change lanes to the right relative to the lane in which vehicle 1 is traveling.

Vehicle controller 7 determines that the travel environment is the one illustrated in part (a) of FIG. 2 based on the information about the travel state and the surrounding situation. Note that vehicle controller 7 may generate the overhead view illustrated in part (a) of FIG. 2, and may cause notification unit 92 to provide notification regarding the generated overhead view in addition to the information about the first behavior and the second behavior.

Part (b) of FIG. 2 illustrates one example of the display on notification unit 92 in response to the travel environment illustrated in part (a) of FIG. 2. In a display range of notification unit 92, options involved with the behavior of vehicle 1 are displayed on the right, and information for switching from autonomous driving to manual driving is displayed on the left.

The first behavior is “lane change” displayed in highlighted display region 29 b in display regions 29 a to 29 c and 29 g. The second behavior is “acceleration” and “deceleration” respectively displayed in display regions 29 a and 29 c. In addition, “end autonomous driving” indicating that the driving mode is switched from autonomous driving to manual driving is displayed in display region 29 g.

Part (c) of FIG. 2 illustrates one example of operating unit 51 provided on steering wheel 5. Operating unit 51 includes operation buttons 51 a to 51 d provided on the right side of steering wheel 5 and operation buttons 51 e to 51 h provided on the left side of steering wheel 5. Note that the number, shape, and other conditions of operating unit 51 provided to steering wheel 5 are not limited to those described above.

In the present exemplary embodiment, display regions 29 a to 29 c illustrated in part (b) of FIG. 2 correspond to operation buttons 51 a to 51 c, respectively, and display region 29 g corresponds to operation button 51 g.

In this configuration, when selecting any one of displays displayed in each display region, the driver presses the operation button corresponding to the selected display region. For example, to select the behavior of “acceleration” displayed in display region 29 a, the driver presses operation button 51 a.

Although only character information is displayed in each display region in part (b) of FIG. 2, a symbol or an icon involved with drive of the vehicle may be displayed as described next. With this configuration, the driver can recognize the display content at a glance.

FIG. 3 is a view illustrating another example of a display on notification unit 92. As illustrated in FIG. 3, character information and symbols indicating the information are both displayed in display regions 39 a to 39 c and 39 g. Note that only symbols may be displayed.

Next, a display control flow will be described, using a specific travel environment as one example.

FIG. 4 is a flowchart illustrating a procedure of an information notification process according to the present exemplary embodiment. FIG. 5 is a view illustrating the first example of the travel environment, and display control for this environment.

As illustrated in FIG. 4, detector 6 detects a travel state of the vehicle (step S11). Then, detector 6 detects the surrounding situation of the vehicle (step S12). Detector 6 outputs to vehicle controller 7 the information about the travel state of the vehicle and the surrounding situation of the vehicle which have been detected.

Next, vehicle controller 7 determines the travel environment at present based on the information about the travel state and the surrounding situation (step S13). In the example in part (a) of FIG. 5, vehicle controller 7 determines the travel environment at present to be “a travel environment in which there is a merging lane ahead in the lane in which vehicle 1 is traveling, there is a vehicle merging from the left side of the lane, and it is possible to change lanes to the right relative to the lane in which vehicle 1 is traveling”.

Then, vehicle controller 7 causes notification unit 92 of information notification device 9 to provide notification regarding the information about the determined travel environment (step S14). In the example in part (b) of FIG. 5, vehicle controller 7 outputs the information about the determined travel environment to information acquisition unit 91. Notification unit 92 acquires the information about the travel environment from information acquisition unit 91, and displays the acquired information as character information 59. Notably, vehicle controller 7 may notify the driver of the information about the travel environment with a sound using speakers or the like, instead of displaying the information about the travel environment on notification unit 92. Accordingly, the information can reliably be transmitted to the driver, even if the driver does not see or fails to see the display or a monitor.

Next, vehicle controller 7 determines whether or not there is a possibility of updating the behavior for the determined travel environment. When determining that there is a possibility of updating, vehicle controller then determines the first behavior and the second behavior (step S15). Whether or not there is a possibility of updating the behavior for the travel environment is determined based on whether or not the travel environment has been changed. Conceivable behaviors to be executed after the updating include decelerating the vehicle because of a possibility of collision between the vehicle and the nearby vehicle or the like, changing the speed when a preceding vehicle disappears in adaptive cruise control (ACC), and changing lanes when the adjacent lane is vacant, for example. Whether or not to perform updating is determined using the conventional technology.

In this case, vehicle controller 7 reads, from storage unit 8, the behavior candidates that can be performed next by vehicle 1 (after a lapse of the first predetermined time) in response to the determined travel environment. Then, vehicle controller 7 determines which is the frost, suitable for the current travel environment from among the read behavior candidates, and sets the behavior most suitable for the current travel environment as the first behavior. Thereafter, vehicle controller 7 sets the behavior candidates excluding the first behavior as the second behavior.

In the example in part (b) of FIG. 5, vehicle controller 7 reads, from storage unit 8, three behavior candidates which are acceleration of vehicle 1, deceleration of vehicle 1, and lane change of vehicle 1 to the right. Then, vehicle controller 7 determines that the lane change of vehicle 1 to the right is the most suitable behavior based on the speed of the vehicle merging from the left and the condition of the right lane vehicle 1, and sets this behavior as the first behavior. Thereafter, vehicle controller 7 sets the behavior candidates excluding the first behavior as the second behavior.

Next, vehicle controller 7 causes notification unit 92 of information notification device 9 to provide notification regarding the first behavior and the second behavior (step S16). In the example in part (b) of FIG. 5, notification unit 92 displays character information of “lane change” which is the information about the first behavior in display region 59 b in a highlighted manner, and displays “acceleration” and “deceleration”, which are the information about the second behavior, in display regions 59 a and 59 c, respectively.

Next, vehicle controller 7 determines whether or not operating unit 51 receives an operation from the driver within a second predetermined time (step S17).

For example, vehicle controller 7 sets, as the first predetermined time, the time from when vehicle controller 7 determines that the travel environment at present is the one illustrated in part (a) of FIG. 5 until vehicle 1 reaches the merging point. Vehicle controller 7 then sets a second predetermined time shorter than the first predetermined time as a time in which the operation for the behavior to be executed next before the merging point can be received.

When operating unit 51 has received the operation from the driver within the second predetermined time (YES in step S17), vehicle controller determines whether the received operation is an operation for ending autonomous driving or a behavior selecting (in other words, updating) operation (step S18).

As described with reference to FIG. 2, the display regions of notification unit. 92 respectively correspond to the operation buttons of operating unit 51. When selecting “end autonomous driving” part (b) of FIG. 5, the driver presses operation button 51 g illustrated in part (c) of FIG. 2. When performing behavior selection, the driver presses any one of operation buttons 51 a to 51 c illustrated in part (c) of FIG. 2.

When the operation received by operating unit 51 is an operation for ending autonomous driving (that is, when the depression of operation button 51 g is detected), vehicle controller 7 ends autonomous driving (step S19). When the operation received by operating unit 51 is the operation for behavior selection (that is, the depression of any one of operation buttons 51 a to 51 c is detected), vehicle controller 7 controls vehicle 1 such that vehicle 1 performs the behavior corresponding to the depressed operation button (step S20).

When operating unit 51 has not received any operation performed by the driver within the second predetermined time (NO in step S17), vehicle controller 7 controls vehicle 1 such that vehicle 1 performs the first behavior (step S21).

FIG. 6 is a illustrating the first example of the travel environment, and another display control for this environment. Part (a) of FIG. 6 is similar to part (a) of FIG. 5, but the display control in part (b) of FIG. 6 is different from the display control part (b) of FIG. 5.

As in the case described with reference to part (b) of FIG. 5, vehicle controller 7 reads, from storage unit 8, three behavior candidates which are acceleration of vehicle 1, deceleration of vehicle 1, and lane change of vehicle 1 to the right, in response to the travel environment illustrated in part (a) of FIG. 6. In this case, it is supposed that storage unit 8 stores the lane change of vehicle 1 to the right as the behavior with the highest priority.

In this case, vehicle controller 7 causes notification unit 92 to provide notification regarding the information about the travel environment and the information about the first behavior. In part (b) of FIG. 6, vehicle controller 7 creates character information 69 indicating the information about the travel environment and the information about the first behavior, and displays character information 69 on notification unit 92.

Then, vehicle controller 7 displays, in display regions 69 a and 69 c, displays for prompting the driver to determine whether to use the first behavior. Vehicle controller 7 also displays, in display region 69 g, the display of “end autonomous driving” indicating that the driving mode is switchable from autonomous driving to manual driving.

In this case, vehicle controller 7 displays “YES” corresponding to using the first behavior in a highlighted manner. Which one of “YES” and “NO” is displayed in a highlighted manner may be set in advance, the last selected option may be displayed in a highlighted manner, or storage unit 8 may store the number of times each behavior has been previously selected and notification unit 92 may display the most frequently selected behavior in a highlighted manner.

By learning the previously selected behavior in this way, vehicle controller 7 can appropriately notify the drive of information. In addition, the display to be displayed on notification unit 92 can be reduced as compared to the example in part (b) of FIG. 5, whereby the burden on the driver can be reduced.

FIG. 7 is a view illustrating a second example of the travel environment, and display control for this environment. Part (a) of FIG. 7 is an overhead view illustrating the travel environment. The travel environment illustrated in part (a) of FIG. 7 is similar to those in part (a) of FIG. 5 and part (a) of FIG. 6 in that there is a merging lane ahead, but different from those in part (a) of FIG. 5 and part (a) of FIG. 6 in that there is a traveling vehicle on the right of vehicle 1. In such a case, vehicle controller 7 determines that it is impossible to change lanes.

When determining that the travel environment of vehicle 1 is the one illustrated in part (a) of FIG. 7, vehicle controller 7 causes notification unit 92 to display information about the determined travel environment as character information 79 as illustrated in part (b) of FIG. 7.

Further, vehicle controller 7 selects only acceleration of vehicle 1 and deceleration of vehicle 1 from among three behavior candidates read from storage unit 8, which are acceleration of vehicle 1, deceleration of vehicle 1, and lane change of vehicle 1 to the right, because the lane change of vehicle 1 to the right is impossible.

In addition, vehicle controller 7 predicts that vehicle 1 may become too close to the merging vehicle if vehicle 1 is traveling with the current speed, and determines that the deceleration of vehicle 1 is the most suitable behavior, that is, the first behavior.

In this case, which is the most suitable behavior among the three behavior candidates is determined using a conventional technology for determining the most suitable behavior based on the information about the travel state and the surrounding situation. Alternatively, which is the most suitable behavior may be determined in advance, or vehicle controller 7 may store the information about the last selected behavior in storage unit 8, and determine this behavior as the most suitable behavior. Alternatively, vehicle controller 7 may store in storage unit 8 the number of times each behavior has been previously selected, and determine the most frequently selected behavior as the most suitable behavior.

Thereafter, vehicle controller 7 displays “deceleration” display region 79 c as the first behavior, and displays “acceleration” display region 79 a as the second behavior. Vehicle controller 7 also displays, in display region 79 g, the display of “end autonomous driving” indicating that the driving mode is switched from autonomous driving to manual driving.

With such display control, vehicle controller 7 can notify the driver of the behavior most suitable for the travel environment as the first behavior according to the travel environment.

The information about the first behavior nay be disposed on an upper side, the information about the second behavior may be disposed on a lower side, and functions for selecting the first behavior and the second behavior may be assigned to operation button 51 a and 51 c, respectively. Alternatively, the information about a behavior of acceleration may be disposed on an upper side, the information about a behavior of deceleration may be disposed on a lower side, the information about the behavior of lane change to the right may be disposed on a right side, the information about the behavior of lane change to the left may be disposed on a left side, and functions for selecting the behavior of acceleration, the behavior of deceleration, the behavior of lane change to the right, and the behavior of lane change to the left may be assigned to operation buttons 51 a, 51 c, 51 b, and 51 d, respectively; or these displays may be switchable, and whether priority is placed on behavior or priority is placed on operation may be displayed separately. In addition, the display size of the first behavior information may be larger, and the display size of the second behavior information may be smaller. It is to be noted that, when behavior information display is arranged corresponding to the behavior in the front rear direction and left-right direction of the vehicle, the driver is capable of having intuitive recognition and operation.

Next, an example of a travel environment other than the travel environment where there is a merging lane ahead will be described.

FIG. 8 is a view illustrating a third example of the travel environment, and display control for this environment. Part (a) of FIG. 8 is an overhead view illustrating the travel environment of vehicle 1. Specifically, part (a) of FIG. 8 illustrates the travel environment where a preceding vehicle is traveling with a speed lower than the speed of vehicle 1, and a lane change to the adjacent lane is possible.

Vehicle controller 7 determines that the travel environment is the one illustrated in part (a) of FIG. 8 based on the information about the travel state and the surrounding situation. In this case, vehicle controller 7 causes notification unit 92 to display the information about the determined travel environment as character information 89.

Vehicle controller 7 also reads, as behavior candidates corresponding to the determined travel environment, three behavior candidates which are a travel mode for overtaking the preceding vehicle, a travel mode for performing a lane change to the adjacent lane, and a travel mode for decelerating vehicle 1 to follow the preceding vehicle, from storage unit 8.

For example, vehicle controller 7 determines that the travel mode for decelerating vehicle 1 to follow the preceding vehicle is the most suitable behavior, that is, the first behavior, because the speed of the preceding vehicle after deceleration is higher than a predetermined value and is allowable.

In this case, which is the most suitable behavior among the three behavior candidates is determined using a conventional technology for determining the most suitable behavior based on the information about the travel state and the surrounding situation. Alternatively, which is the most suitable behavior may be determined in advance, or vehicle controller 7 may store the information about the last selected behavior in storage unit 8, and determine this behavior as the most suitable behavior. Alternatively vehicle controller 7 may store in storage unit 8 the number of times each behavior has been previously selected, and determine the most frequently selected behavior as the most suitable behavior.

Vehicle controller 7 also displays character information of “follow” indicating the first behavior in display region 89 c in a highlighted manner, and character information items of “overtake” and “lane change” indicating the second behavior in display regions 89 a and 89 b, respectively, as illustrated in part (b) of FIG. 8. Vehicle controller 7 also displays, in display region 89 g, the display of “end autonomous driving” indicating that the driving mode is switched from autonomous driving to manual driving.

The information about the first behavior may be disposed on an upper side, the information about the second behavior may be disposed on a lower side, and functions for selecting the first behavior and the second behavior may be assigned to operation buttons 51 a and 51 c, respectively. Alternatively, the information about an overtaking behavior may be disposed on an upper side, the information about a following behavior may be disposed on a lower side, the information about the behavior of lane change to the right may be disposed on right side, the information about the behavior of lane change to the left may be disposed on a left side, and functions for selecting the overtaking behavior, the following behavior, the behavior of lane change to the right, and the behavior of lane change to the left may be assigned to operation buttons 51 a, 51 c, 51 b, and 51 d, respectively; or these displays may be switchable, and whether priority is placed on behavior or priority is placed on operation may be displayed separately. In addition, the display size of the first behavior information may be larger, and the display size of the second behavior information may be smaller.

FIG. 9 is a view illustrating a fourth example of the travel environment, and display control for this environment. Part (a) of FIG. 9 is an overhead view illustrating the travel environment of vehicle 1. Specifically, part (a) of FIG. 9 illustrates the travel environment where the lane in which vehicle 1 is traveling ends ahead.

Vehicle controller 7 determines that the travel environment is the one illustrated in part (a) of FIG. 9 based on the information about the travel state and the surrounding situation. In this case, vehicle controller 7 causes notification unit 92 to display the information about the determined travel environment as character information 99.

Vehicle controller 7 also reads, as behavior candidates corresponding to the determined travel environment, two behavior candidates which are a travel mode for performing a lane change to the adjacent lane, and a travel mole for keeping traveling in the current lane, from storage unit 8.

For example, vehicle controller 7 determines that the travel mode for performing a lane change to the adjacent lane is the most suitable behavior, that is, the first behavior, because TTC to the point where the lane ends is shorter than a predetermined value.

In this case, which is the most suitable behavior between the two behavior candidates is determined using a conventional technology for determining the most suitable behavior based on the information about the travel state and the surrounding situation. Alternatively, which is the most suitable behavior may be determined in advance, or vehicle controller 7 may store the information about the last selected behavior in storage unit 8, and determine this behavior as the most suitable behavior. Alternatively, vehicle controller 7 may store in storage unit 8 the number of times each behavior has been previously selected, and determine the most frequently selected behavior as the most suitable behavior.

Vehicle controller 7 also displays character information of “lane change” indicating the first behavior in display region 99 b in a highlighted manner, and character information of “keep” indicating the second behavior in display region 99 c, as illustrated in part (b) of FIG. 9. Vehicle controller 7 also displays, in display region 99 g, the display of “end autonomous driving” indicating that the driving mode is switched from autonomous driving to manual driving.

The information about the first behavior may be disposed on an upper side, the information about the second behavior may be disposed on a lower side, and functions for selecting the first behavior and the second behavior may be assigned to operation buttons 51 a and 51 c, respectively; information about a behavior of doing nothing may be disposed on a lower side, the information about the behavior of lane change to the right may be disposed on a right side, the information about the behavior of lane change to the left may be disposed on a left side, and functions for selecting the behavior of doing nothing, the behavior of lane change to the right, and the behavior of lane change to the left may be assigned to operation buttons 51 c, 51 b, and 51 d, respectively; these displays may be switchable, and whether priority is placed on behavior or priority is placed on operation may be displayed separately. In addition, the display size of the first behavior information may be larger, and the display size of the second behavior information may be, smaller. Notably, due to the configuration in which a different function is assigned to each display region depending on a different travel environment as illustrated in FIGS. 7, 8, and 9, notification of information or operation is enabled with fewer regions.

It has been described above that vehicle controller 7 causes notification unit 92 to provide notification regarding a behavior according to the information about the travel environment and surrounding situation. However, the present invention is not limited thereto. For example, it may be configured such that vehicle controller 7 causes notification unit 92 to provide notification regarding a behavior when the driver performs a predetermined operation.

FIG. 10 is a view illustrating a fifth example of the travel environment, and display control for this environment. Part (a) of FIG. 10 is an overhead view illustrating the travel environment of vehicle 1. Specifically, part (a) of FIG. 10 illustrates the travel environment where vehicle 1 can change lanes to the left and right.

Part (a) of FIG. 10 illustrates the travel environment where, different from the travel environments illustrated in part (a) of FIG. 5 to part (a) of FIG. 9, vehicle 1 can travel in a normal way without requiring a lane change or acceleration and deceleration of the vehicle. In this case, vehicle controller 7 may cause notification unit 92 not to display the information about the travel environment as character information as indicated by display 109 in part (b) of FIG. 10.

When the driver depresses any of the operation buttons on operating unit 51 under the above-described condition where character information is not displayed on notification unit 92, vehicle controller 7 reads the behavior candidates for normal traveling from storage unit 8.

Specifically, storage unit 8 stores four behavior candidates which are acceleration of vehicle 1, deceleration of vehicle 1, lane change of vehicle 1 to the right, and lane change of vehicle 1 to the left, in association with the travel environment of normal traveling as illustrated in part (a) of FIG. 10. Vehicle controller 7 reads these behavior candidates, and displays these behavior candidates in display regions 109 a to 109 d of notification unit 92, respectively.

In addition, vehicle controller 7 displays the display of “end autonomous driving” indicating that the driving mode is switched from autonomous driving to manual driving in display region 109 g, and a display of “cancel” indicating that updating of the behavior is canceled in display region 109 e in a highlighted manner.

The present exemplary embodiment described above can effectively notify the driver of the behavior candidates to be executed next, thereby enabling the driver to select a more preferable behavior.

Note that the driver may directly perform a manual operation on the steering wheel or the like, instead of selecting the behavior he/she intends to do. Thus, the driver can quickly switch to a manual driving operation according to his/her intention.

[Modification]

In the present exemplary embodiment described above, character information is displayed on notification unit 92. However, the present invention is not limited thereto. For example, information may be displayed using a symbol indicating the behavior for enabling the driver to visually recognize the information. Hereinafter, a display using a symbol for enabling the driver to visually recognize information will be described, using the displays in FIGS. 5 and 7 as one example.

FIG. 11 is a view illustrating another display control for the first example of the travel environment illustrated in FIG. 5. In this example, the above-described first behavior is a lane change of vehicle 1 to the right, and the second behavior is acceleration of vehicle 1 and deceleration of vehicle 1.

In this case, symbol 111 indicating “lane change” which is the first behavior is displayed bigger on the center, and symbol 112 indicating “acceleration of vehicle 1” and symbol 113 indicating “deceleration of vehicle 1” which are the second behavior are displayed smaller on the right. In addition, symbol 114 indicating ending of autonomous driving is displayed smaller on the left.

If an instruction for changing the behavior of vehicle 1 is not received from the driver, the lane change is performed.

FIG. 12 is a view illustrating another display control for the second example of the travel environment illustrated in FIG. 1. In this example, different from the first example, a lane change is impossible because the nearby vehicle is traveling on the right of vehicle 1. Therefore, “deceleration of vehicle 1” is set as the first behavior, and “acceleration of vehicle 1” is set as the second behavior, for example.

In this case, as illustrated in part (a) of FIG. 12, symbol 121 indicating “deceleration of vehicle 1” which is the first behavior is displayed bigger on the center, and symbol 122 indicating “acceleration of vehicle 1” which is the second behavior is displayed smaller on the right. In addition, symbol 123 indicating ending of autonomous driving is displayed smaller on the left.

It is supposed here that operating unit 51 receives an operation for selecting “acceleration of vehicle 1” from the driver. In this case, as illustrated in part (b) of FIG. 12, symbol 122′ indicating acceleration of vehicle 1″ which is the first behavior is displayed bigger on the center, and symbol 121′ indicating “deceleration of vehicle 1” which is the second behavior is displayed smaller on the right.

The present exemplary embodiment described above can effectively notify the driver of the behavior candidates to be executed next, thereby enabling the driver to select a more preferable behavior. On the other hand, the driver can recognize the behaviors to be executed by vehicle 1 or other selectable behaviors, thereby being able of continuing autonomous driving with a feeling of trust. Alternatively, the driver can smoothly issue an instruction to the vehicle.

In addition, according to the present exemplary embodiment, the options notified by the notification unit, that is, the second behavior, can be variable according to the travel environment.

Second Exemplary Embodiment

The first exemplary embodiment has described the configuration in which an operation according to the display on notification unit 92 is performed using operating unit 51 provided on steering wheel 5. The present exemplary embodiment describes a configuration in which a touch panel is provided in place of operating unit 51 provided on steering wheel 5.

FIG. 13 is a block diagram illustrating a configuration of a main part of vehicle 1 including an information notification device according to the second exemplary embodiment. It should be noted that constituent elements in FIG. 13 which are substantially identical to the constituent elements in FIG. 1 are denoted by the identical reference marks used in FIG. 1 and will not be described in detail. Vehicle 1 illustrated in FIG. 13 is provided with touch panel 10 in place of operating unit 51 on steering wheel 5.

Touch panel 10 is a device including a liquid crystal panel or the like and capable of displaying and inputting information, and is connected to vehicle controller 7. Touch panel 10 includes display unit 101 that displays information based on control by vehicle controller 7, and input unit 102 that receives an operation from a driver or the like and outputs the received operation to vehicle controller 7.

Next, display control for touch panel 10 will be described. Herein, the display control will be described for the case where vehicle 1 is traveling on the center lane of three lanes, and vehicle 1 is capable of changing the lane to the right lane or the left lane.

FIG. 14 is a view for describing the display on touch panel 10 according to the second exemplary embodiment. Part (a) of FIG. 14 illustrates an initial display on display unit 101 of touch panel 10. When determining that vehicle 1 is capable of changing the lane to the right lane or the left lane, vehicle controller 7 causes display unit 101 of touch panel 10 to execute the display illustrated in part (a) of FIG. 14. Herein, the display of “Touch” in display region 121 indicates that touch panel 10 is in a mode capable of receiving a touch operation performed by the driver.

When the driver performs the touch operation touching display region 121 with the display illustrated in part (a) of FIG. 14 being displayed therein, input unit 102 receives the touch operation, and outputs to vehicle controller 7 information indicating that the touch operation is performed. When receiving this information, vehicle controller 7 displays the display illustrated in part (b) of FIG. 14 on display unit 101, and also displays the display illustrated in part (c) of FIG. 14 on notification unit 92.

In part (b) of FIG. 14, display region 121 a having therein a display of “Move” which is an operation for instructing vehicle 1 to move is illustrated. In addition, display regions 121 b to 121 d indicating that it is possible for vehicle 1 to travel in each of three lanes are illustrated in part (b) of FIG. 14. Note that display regions 121 b to 121 d respectively correspond to traveling in lanes indicated by arrows X, Y, and Z in part (c) of FIG. 14.

In addition each display region in part (b) of FIG. 14 and the corresponding arrow in part (c) of FIG. 14 have the same manner (for example, color, arrangement, and the like). This makes the display easy to be understood by the driver.

In addition, the lanes indicated by arrows X, Y, and Z may be displayed by varying thickness or the like such that the behavior to be executed by the vehicle determined by the vehicle controller and other behaviors selectable by the driver can be distinguished from each other.

The driver touches the display region corresponding to the lane he/she intends to travel, from among display regions 121 b to 121 d, to select the behavior of vehicle 1. In this case, input unit 102 receives the behavior selecting operation performed by the driver, and outputs information about the selected behavior to vehicle controller 7. Then, vehicle controller 7 controls vehicle 1 such that vehicle 1 executes the selected behavior. Thus, vehicle 1 travels in the lane the driver intends to travel.

It is to be noted that the driver may swipe touch panel 10 instead of touching touch panel 10. For example, when the driver intends to change the lane to the lane indicated by arrow X in part (c) of FIG. 14 in the ample in FIG. 14, the drive swipes right on touch panel 10.

In this case, input unit 102 receives the swipe operation, and outputs the information indicating the swipe operation content to vehicle controller 7. Then, vehicle controller 7 controls vehicle 1 such that vehicle 1 executes the selected behavior of changing the lane to the lane indicated by arrow X.

In addition, when display region 121 a displaying “Move” which indicates the operation for instructing vehicle 1 to move is displayed, the driver may utter “behavior selection” in a voice. Thus, the driver can perform operation by seeing only the display on the HUD without seeing the touch panel at his/her hand.

In addition, when the driver performs the touch operation or swipe operation, the display manner of the lane corresponding to the selected display region of the touch panel may be changed such that the driver can confirm which lane he/she is about to select before the selection. For example, the moment the driver touches display region 121 b, the thickness of lane X may be enlarged, and if the driver immediately releases his/her hand, lane X may not be selected and the thickness of lane X may be returned to the original size; and the moment the driver then touches display region 121 c, the thickness of lane Y may be enlarged, and if the driver keeps this state for a while, lane Y may be selected and may flicker to indicate that lane Y is determined. According to this configuration, the driver can perform the selecting operation or determining operation without viewing his/her hands.

Notably, as in the first exemplary embodiment, vehicle control functions such as acceleration, deceleration, overtake, and keep may be assigned to display regions according to the travel environment.

According to the present exemplary embodiment described above, the driver can perform an intuitive operation due to the touch panel being provided in place of the operating unit. Furthermore, because the number, shape, color, and the like of display regions in the touch panel receiving an operation can freely be changed, the degree of freedom of a user interface is improved.

Third Exemplary Embodiment

The first exemplary embodiment has described the case where the first behavior and the second behavior are simultaneously displayed. The present exemplary embodiment describes a configuration in which a first behavior is displayed first on notification unit 92, and when a driver's operation is received, a second behavior is displayed.

The configuration of the present exemplary embodiment is achieved such that a grip sensor for detecting whether or not the driver holds steering wheel 5 is further included in operating unit 51 in the configuration illustrated in FIG. 1 in the first exemplary embodiment.

FIG. 15 is a view for describing a display on notification unit 92 according to the third exemplary embodiment of the present invention. FIG. 15 illustrates an example of a display in a travel environment, similar to that illustrated in part (a) of FIG. 8, where a vehicle traveling ahead of vehicle 1 in the same lane is traveling with a speed lower than the speed of vehicle 1 and a lane change to the adjacent lane is possible.

When determining that the travel environment is the one illustrated in part (a) of FIG. 8, vehicle controller firstly causes notification unit 92 to execute the display illustrated in part (a) of FIG. 15.

In part (a) of FIG. 15, symbol 131 indicating “overtake” which is the first behavior among behavior candidates to be executed after a lapse of a first predetermined time is illustrated in a first manner (for example, in a first color).

When a second predetermined time has elapsed after vehicle controller 7 causes notification unit 92 to execute the display illustrated in part (a) of FIG. 15, vehicle controller 7 causes notification unit 92 to change the display manner of symbol 131 from the first manner and display symbol 131 in a second manner different from the first manner (for example, in a second color different from the first color). Herein, the second predetermined time is similar to the second predetermined time described in the first exemplary embodiment.

Specifically, while symbol 131 is displayed in the first manner, the driver is able to select the second behavior, but when symbol 131 is changed to the second manner, it becomes impossible for the driver to select the second behavior.

Part (a) of FIG. 15 also illustrates steering-wheel-shaped symbol 132 indicating that the second behavior is selectable. When the driver holds steering wheel 5 while symbol 132 is displayed, the second behavior is displayed. Symbol 132 is a display indicating that the second behavior is selectable. However, the driver may be notified that the second behavior is selectable by symbol 131 being displayed in the first manner. In this case, symbol 132 may not be displayed.

Part of FIG. 15 also illustrates symbol 133 medicating that vehicle 1 is now in an autonomous driving mode. Symbol 133 is an auxiliary display notifying the driver that vehicle 1 is now traveling in the autonomous driving mode. However, symbol 133 may not be displayed.

When the driver holds steering wheel 5 in response to the display in part (a) of FIG. 15, the grip sensor detects the holding, and outputs information about the detection result to vehicle controller 7. In this case, vehicle controller 7 causes notification unit 92 to execute the display illustrated in part (b) of FIG. 15.

In part (b) of FIG. 15, symbol 131 indicating “overtake” which is the first behavior is illustrated in the first manner (for example, in the first color) as in part (a) of FIG. 15. In addition, symbol 134 indicating “lane change” which is the second behavior and symbol 135 indicating “deceleration” which is the second behavior are also illustrated.

The driver performs changing from the first behavior to the second behavior through operation on operating unit 51 on steering wheel 5. For example, the driver updates the behavior to “lane change” (symbol 134) or “deceleration” (symbol 135) by pressing operation button 51 a or operation button 51 c (see part (c) of FIG. 2) on operating unit 51.

Further, symbol 136 indicating that vehicle controller 7 is learning the behavior of vehicle 1 is illustrated in part (b) of FIG. 15. While symbol 136 is displayed, vehicle controller 7 learns the behavior selected by the driver. Symbol 136 may not be displayed. Further, vehicle controller 7 may constantly learn behaviors.

Specifically, vehicle controller 7 stores the behavior selected by the driver into storage unit 8, and when vehicle 1 encounters again the similar travel environment, vehicle controller 7 causes notification unit 92 to display the stored behavior as the first behavior. Alternatively, vehicle controller may store, in storage unit 8, the number of times each behavior has been previously selected, and cause notification unit 92 to display the most frequently selected behavior as the first behavior.

In part (b) of FIG. 15, symbol 137 indicating that vehicle 1 is not in the autonomous driving mode is also illustrated. When symbol 137 is displayed, vehicle controller 7 waits until the behavior to be executed after a lapse of the first predetermined time is selected by the driver.

When the driver presses operation button 51 a on operating unit 51 in response to the display illustrated in part (b) of FIG. 15 to select “lane change”, vehicle controller 7 receives the information about the selecting operation, and causes notification unit 92 to execute the display illustrated in part (c) of FIG. 15.

In part (c) of FIG. 15, symbol 134′ indicating “lane change” is illustrated in the first manner. When receiving the information about the operation for selecting “lane change”, vehicle controller 7 determines that the selected behavior is the behavior that is to be executed next, and causes notification unit 92 to display symbol 134′ indicating “lane change” in the first manner.

Further, symbol 131 which has been displayed as the first behavior in part (b) of FIG. 15 is switched to symbol 134, and displayed as symbol 134′ in part (c) of FIG. 15.

When the driver presses twice in succession any one of the operation buttons in response to the display illustrated in part (c) of FIG. 15, the selecting operation previously conducted by the driver may be canceled. In this case, vehicle controller 7 receives the information about the operation for pressing any one of the operation buttons twice in succession, and causes notification unit 92 to execute changing from the display illustrated in part (c) of FIG. 15 to the display illustrated in part (b) of FIG. 15.

In a period from the time when vehicle controller 7 causes notification unit 92 to execute the display illustrated in part (a) of FIG. 15 until the second predetermined time has elapsed, vehicle controller 7 changes the display on notification unit 92 to the display illustrated in part (b) of FIG. 15 and the display illustrated in part (c) of FIG. 15 based on the operation performed by the driver. Then, vehicle controller 7 causes notification unit 92 to execute the display illustrated in part (d) of FIG. 15 when the second predetermined time has elapsed after vehicle controller 7 causes notification unit 92 to execute the display illustrated in part (a) of FIG. 15.

Notably, when acquiring, from the grip sensor, the information indicating that the driver releases his/her hand from steering wheel 5, vehicle controller 7 may cause notification unit 92 to display the display illustrated in part (d) of FIG. 15 before the second predetermined time has elapsed.

In this case, part (d) of FIG. 15 illustrates the state where symbol 134′ indicating “lane change” selected by the driver as the next behavior is displayed in the second manner, and symbol 133 indicating that vehicle 1 is traveling in the autonomous driving mode is displayed again.

According to the present exemplary embodiment described above, vehicle controller 7 changes the display on notification unit 92 such that the driver can confirm the other behavior candidates, only when the driver intends to update the behavior to be executed next. According to this configuration, the display visually confirmed by the driver can be reduced, whereby the burden on the driver can be reduced.

Fourth Exemplary Embodiment

The above-mentioned exemplary embodiments have described some of the methods for determining which is the most suitable behavior from among a plurality of behavior candidates executable by vehicle 1. The present exemplary embodiment describes a case where a driver model constructed in advance by learning is used as the method for determining the most suitable behavior.

The method for constructing the driver model will now be described. The driver model is constructed in such a way that the tendency of an operation performed by a driver for each travel environment is modeled based on information relating to the frequency of each operation. Travel histories of a plurality of drivers are aggregated, and the driver model is constructed from the aggregated travel histories.

The travel history of each driver is formed such that the frequency of a behavior actually selected by the driver from among behavior candidates respectively corresponding to travel environments is aggregated for each behavior candidate, for example.

FIG. 16 is a diagram showing one example of the travel history. FIG. 16 shows that driver x selects the behavior candidate of “deceleration” three times, “acceleration” once, and “lane change” five times, in a travel environment where “the vehicle approaches a merging lane”. FIG. 16 also shows that driver x selects the behavior candidate of “follow” twice, “overtake” twice, and “lane change” once, in a travel environment where “there is a low-speed vehicle ahead”. FIG. 16 also shows the travel history of driver y in a similar way.

The travel history of the driver may be formed by aggregating the behaviors selected during autonomous driving, or by aggregating the behaviors actually executed by the driver during manual driving. Thus, travel histories can be collected according to a driving state, i.e., autonomous driving or manual driving.

The driver model is classified into clustering type constructed by clustering travel histories of a plurality of drivers, and an individually-adapted type in which a driver model of a specific driver (for example, driver x) is constructed based on a plurality of travel histories similar to the travel history of driver x.

Firstly, the clustering type will be, described. The clustering-type driver model is constructed in such a way that travel histories of a plurality of drivers illustrated in FIG. 16 are aggregated in advance. Then, a plurality of drivers having a high degree of similarity between the travel histories, that is, a plurality of drivers having a similar driving operation tendency, is grouped to construct a driver model.

FIG. 17 is a diagram showing a method for constructing the clustering-type driver model. FIG. 17 shows travel histories of drivers a to f in tabular form. FIG. 17 shows that, from the travel histories of drivers a to f, model A is constructed based on the travel histories of drivers a to c, and model B is constructed based on the travel histories of drivers d to f.

The degree of similarity between travel histories may be obtained such that: for example, frequencies (numerical values) in the travel histories of driver a and driver b are treated as frequency distributions; a correlation value in the respective frequency distributions is calculated; and the calculated correlation value is set as the degree of similarity. In this case, when the correlation value calculated from the travel histories of driver a and driver b is higher than a predetermined value, for example, the travel histories of driver a and driver b are grouped into a single group.

Note that the calculation of the degree of similarity is not limited thereto. For example, the degree of similarity may be calculated based on the same number of the behavior having the highest frequency in the travel history of driver a and the travel history of driver b.

Then, the clustering-type driver model is constructed by calculating the average of the frequencies in the travel histories of the drivers in each group, for example.

FIG. 18 is a diagram showing one example of the constructed clustering-type driver model. The average frequency of the travel history in each group is derived by calculating the average of the frequencies in the travel histories of the drivers in each group shown in FIG. 17. In this way, the clustering-type driver model is constructed using the average frequency for the behavior determined for each travel environment.

It is to be noted that the driver model may be constructed using only the behavior having the highest frequency from among the calculated average frequencies. FIG. 19 is a diagram showing her example of the constructed clustering-type driver model. As shown in FIG. 19, the most frequent behavior is selected for each travel environment, and the driver model is constructed using the selected behavior.

Now, a method for using the constructed clustering type driver model will be described with examples.

The driver model shown in FIG. 18 is stored in advance in storage unit 8 of vehicle 1. In addition, vehicle controller 7 stores, in storage unit 8, the travel history of driver y in previous driving. Notably, driver y is detected by a camera or the like (not illustrated) installed in the vehicle interior.

Then, vehicle controller 7 calculates the degree of similarity between the travel history of driver y and the travel history of each model in the driver model to determine which model is the most suitable for driver y. For example, regarding the travel history of driver y shown in FIG. 16 and the driver model shown in FIG. 18, vehicle controller 7 determines that model B is the most suitable for driver y.

Vehicle controller 7 determines that, in actual autonomous travel, the behavior having the highest frequency is the behavior most suitable for driver y, that is, the first behavior, in each travel environment model B.

In this way, the notification regarding the behavior more suitable for the driver can be provided by constructing in advance the driver model from the travel histories of a plurality of drivers.

For example, even when the frequency of the behavior for the travel environment of “there is a low-speed vehicle ahead” is zero in the travel history of driver y as shown in FIG. 16, that is, even when the driver has never selected the behavior of “follow”, “overtake”, and “lane change” in the travel environment of “there is a low-speed vehicle ahead”, vehicle controller 7 can determine the behavior of “follow” as the first behavior in the travel environment of “there is a low-speed vehicle ahead” based on model B shown in FIG. 18.

Next, the individually-adapted type will be described. The individually-adapted-type driver model is constructed in such a way that travel histories of a plurality of drivers shown in FIG. 16 are aggregated in advance, as in the method for constructing the clustering-type. The individually-adapted type driver model is different from the clustering type in that the individually-adapted type driver model is constructed for each driver. Hereinafter, an example of constructing the driver model for driver y will be described.

Firstly, travel histories of a plurality of drivers having a high degree of similarity with the travel history of driver y are extracted from the aggregated travel histories of a plurality of drivers. Then, the driver model for driver y is constructed based on the extracted travel histories of a plurality of drivers.

FIG. 20 is a diagram showing a method for constructing the individually-adapted-type driver model. As in FIG. 17, FIG. 20 shows the travel histories of drivers a to f in tabular form, FIG. 20 also shows that the driver model for driver y is constructed based on the travel histories of drivers c to e having a high degree of similarity with the travel history of driver y shown in FIG. 16.

The individually-adapted-type driver model is constructed by calculating the average of the frequencies in the extracted travel histories of the drivers.

FIG. 21 is a diagram showing one example of the constructed individually-adapted-type driver model. In the travel history of driver y shown in FIG. 16 and the travel histories of drivers c to e shown in FIG. 20, the average frequency of each behavior is derived for each travel environment in this way, the individually-adapted-type driver model for driver y is constructed using the average frequency for the behavior corresponding to each travel environment.

Now, a method for using the constructed individually-adapted type driver model will be described with examples.

The driver model for driver y shown in FIG. 21 is stored in advance in storage unit 8 of vehicle 1. In addition, vehicle controller stores, in storage unit 8, the travel history of driver y in previous driving. Notably, driver y is detected by a camera or the like (not illustrated) installed in the vehicle interior.

Vehicle controller 7 then determines that, in actual autonomous travel, the behavior having the highest frequency is the behavior most suitable for driver y, that is, the first behavior, in each travel environment in the driver model for driver y.

In this way, the notification regarding the behavior more suitable for the driver can be provided by constructing in advance a personal driver model of the driver based on the travel histories of a plurality of drivers.

For example, even when the frequency of the behavior for the travel environment of “there is a low-speed vehicle ahead” is zero in the travel history of driver y as shown in FIG. 16, that is, even when the driver has never selected the behavior of “follow”, “overtake”, and “lane change” in the travel environment of “there is a low-speed vehicle ahead”, vehicle controller can determine the behavior of “lane change” as the first behavior in the travel environment of “there is a low-speed vehicle ahead” based on the driver model shown in FIG. 21.

A description will next be given of a case where driving characteristics of a driver (driving tendency) are acquired, and autonomous driving according to the preference of the driver is performed. In general, the actual operation (for example, the level of acceleration or deceleration, or an operation amount of a steering wheel) for one behavior (for example, lane change) differs for each driver. Therefore, if autonomous driving according to the preference of the driver is performed, more comfortable driving for the driver can be achieved.

In the following, the case where the driving characteristics of the driver are acquired during manual driving and the acquired driving characteristics are reflected in autonomous driving will be described. However, the present invention is not limited thereto.

Vehicle controller extracts a characteristic amount indicating the driving characteristics of the driver based on the content of an operation performed by the driver for each component in vehicle 1, and stores the acquired amount in storage unit 8. Herein, examples of the characteristic amount include a characteristic amount pertaining to a speed, a characteristic amount pertaining to steering, a characteristic a mount pertaining to an operation timing, a characteristic amount pertaining; to vehicle exterior sensing, and a characteristic amount pertaining to vehicle interior sensing.

The characteristic amount pertaining to a speed is the speed, acceleration rate, deceleration rate, or the like of the vehicle, for example, and these characteristic amounts are acquired from a speed sensor or the like mounted to the vehicle.

The characteristic amount pertaining to steering includes a steering angle, steering angular velocity, steering angular acceleration, and the like, for example, and these characteristic amounts are acquired from steering wheel 5.

The characteristic amount pertaining to an operation timing includes an operation timing of the brake, accelerator, indicator lever, steering wheel, and the like, for example, and these characteristic amounts are acquired respectively from brake pedal 2, accelerator pedal 3, for lever 4, and steering wheel 5.

The characteristic amount pertaining to vehicle external sensing includes distances between vehicle 1 and a vehicle present in front of, at the side of, and at the back of vehicle 1, for example, and these characteristic amounts are acquired from sensor 62.

The characteristic amount pertaining to vehicle interior sensing includes personal identification information indicating who the driver is and who the fellow passenger is, for example, and these characteristic amounts are acquired from a camera or the like installed in the vehicle interior.

For example, when the driver manually performs a lane change, vehicle controller 7 detects that the driver manually performs the lane change. The detection is performed by analyzing operation time-series data which is acquired from controller area network (CAN) information by establishing rules on operation time-series data for a lane change in advance. Upon detection, vehicle controller 7 acquires the characteristic amounts described above. Vehicle controller 7 stores characteristic amounts in storage unit 8 for each driver, and constructs a driving characteristic model.

Note that vehicle controller 7 may construct the driver model based on the characteristic amount for each driver. Specifically, vehicle controller extracts a characteristic amount pertaining to a speed, a characteristic amount pertaining to steering, a characteristic amount pertaining to an operation timing, a characteristic amount pertaining to vehicle exterior sensing, and a characteristic amount pertaining to vehicle interior sensing, and stores the extracted characteristic amounts into storage unit 8. Then, vehicle controller 7 may construct, based on the characteristic amounts stored in storage unit 8, a driver model in which the operation tendency of the driver for each travel environment and information about the frequency of each operation are associated with each other.

FIG. 22 is a diagram showing one example of a driving characteristic model, FIG. 22 shows the characteristic amounts for each driver in tabular form. FIG. 22 also shows the number of times each driver has previously selected each behavior. Although FIG. 22 shows only some of the characteristic amounts described above, FIG. 22 may contain any of or all of the characteristic amounts described above.

The characteristic amounts shown in FIG. 22 will be described in detail. Numerical values in terms of the speed represent the actual speed in stages. Numerical values in terms of the steering wheel, the brake, and the accelerator represent operation amounts in stages. These numerical values are obtained such that the averages of the speed and the operation amounts for the steering wheel, the brake, and the accelerator during a predetermined previous time period are calculated, and the calculated averages are shown in stages.

For example, when driver x performs a lane change without having a fellow passenger in FIG. 22, the speed level is 8, and the operation amount levels for the steering wheel, the brake, and the accelerator are respectively 4, 6, and 8.

While in autonomous driving, vehicle controller 7 selects, from the driving characteristic models in FIG. 22, the driving characteristic model corresponding to the driver, behavior, and fellow passenger, according to who the driver is, behavior is executed and who the fellow passenger is.

Then, vehicle controller 7 causes vehicle 1 to travel with the speed corresponding to the selected driving characteristic model, and controls vehicle 1 in combination with the operation amounts and operation tunings for the steering wheel, the brake, and the accelerator. Thus, autonomous driving according to the preference of the driver can be achieved. Note that the notification regarding the information about the driving characteristic model shown in FIG. 22 can be provided by notification unit 92.

FIG. 23 is a view for describing a display on notification unit 92 according to the fourth exemplary embodiment of the present invention. FIG. 23 is a view illustrating a display in response to the first example of the travel environment illustrated in FIG. 5.

Part (a) of FIG. 23 illustrates a display on notification unit 92 when vehicle 1 performs normal travel without requiring a lane change or acceleration/deceleration of the vehicle. In part (a) of FIG. 23, symbol 231 indicating that the driver was a driving characteristic of “frequently decelerating” symbol 232 indicating that the vehicle is now in an autonomous driving mode are illustrated.

Vehicle controller 7 determines the driving characteristic of the driver based on the number of times the driver has previously selected each behavior included in the driving characteristic model shown in FIG. 22, for example. In this case, vehicle controller 7 causes notification unit 92 to display a display including symbol 231 as illustrated in FIG. 23 for the driver who frequently “decelerates” (that is, the driver who frequently selects the behavior of “deceleration”) based on the driving characteristic, for example.

When determining that the travel environment is the first example illustrated in FIG. 5, vehicle controller 7 determines that the first behavior is “deceleration” based on the driver's driving characteristic of “frequently decelerating”, and causes notification unit 92 to execute the display in part (b) of FIG. 23.

In part (b) of FIG. 23, symbol 233 indicating “deceleration” which is the first behavior is illustrated in the first manner (for example, in the first color). Symbol 234 indicating “acceleration” which is the second behavior and symbol 235 indicating “lane change” which is the second behavior are also illustrated.

When the driver changes the behavior to the behavior of “acceleration” by the operation described in the first exemplary embodiment, vehicle controller 7 causes notification unit 92 to execute the display in part (c) of FIG. 23.

In part (c) of FIG. 23, symbol 234′ indicating “acceleration” which is the selected behavior is illustrated in the first manner. Further, symbol 233 which has been displayed as the first behavior in part (b) of FIG. 23 is switched to symbol 234 and displayed as symbol 233′.

Then, vehicle controller r causes notification unit 92 to execute the display illustrated in part (d) of FIG. 23 when the second predetermined time has elapsed after vehicle controller causes notification unit 92 to execute the display illustrated in part (a) of FIG. 23. In part (d) of FIG. 23, symbol 234′ indicating “acceleration” selected as the next behavior by the driver is displayed in the second manner.

When the behavior to be executed next is determined to be “acceleration”, vehicle controller 7 reads characteristic amounts corresponding to the behavior of “acceleration” included in the driving characteristic model, and controls vehicle 1 such that vehicle 1 performs “acceleration” with these characteristic amounts being reflected thereon.

FIG. 24 is a view for describing a display on notification unit 92 according to the fourth exemplary embodiment of the present invention. FIG. 24 is a view illustrating a display in response to the second example of the travel environment illustrated in FIG. 7. It should be noted that constituent elements in FIG. 24 which are substantially identical to the constituent elements FIG. 23 are denoted by the identical reference marks used in FIG. 23 and not be described in detail. FIG. 24 is obtained by deleting symbol 235 indicating “lane change” from FIG. 23.

As mentioned previously, in the second example (FIG. 7), different from the first example (FIG. 5), a lane change is impossible because the nearby vehicle is traveling on the right of vehicle 1. Therefore, “lane change” is not displayed in parts (b) and (c) of FIG. 24. Further, in the example in part (c) of FIG. 24, because “acceleration” is selected as in part (c) of FIG. 23, vehicle controller 7 reads characteristic amounts corresponding to the behavior of “acceleration” included in the driving characteristic model, and controls vehicle 1 such that vehicle 1 performs “acceleration” with these characteristic amounts being reflected thereon, as part (c) of FIG. 23.

FIG. 25 is a view for describing a display on notification unit 92 according to the fourth exemplary embodiment of the present invention. FIG. 25 is a view illustrating a display in response to the third example of the travel environment illustrated in FIG. 8.

Part (a) of FIG. 25 is the same as part (a) of FIG. 23. When determining that the travel environment is the third example illustrated in FIG. 8, vehicle controller 7 determines that the first behavior is “deceleration” based on the driver's driving characteristic of “frequently decelerating”, and causes notification unit 92 to execute the display in part (b) of FIG. 25.

In part (b) of FIG. 25, symbol 251 indicating “deceleration” which is the first behavior is illustrated in the first manner (for example, in the first color). Symbol 252 indicating “overtake” which is the second behavior and symbol 253 indicating “lane change” which is the second behavior are also illustrated.

When the driver changes the behavior to the behavior of “overtake” by the operation described in the first exemplary embodiment, vehicle controller 7 causes notification unit 92 to execute the display in part (c) of FIG. 25.

In part (c) of FIG. 25, symbol 252′ indicating “overtake” which is the selected behavior is illustrated in the first manner. Further, symbol 251 which has been displayed as the first behavior in part (b) of FIG. 25 is switched to symbol 252 and displayed as symbol 251′.

Then, vehicle controller 7 causes notification unit 92 to execute the display illustrated in part (d) of FIG. 25 when the second predetermined time has elapsed after vehicle controller 7 causes notification unit 92 to execute the display illustrated in part (a) of FIG. 25. In part (d) of FIG. 25, symbol 252′ indicating “overtake” selected as the next behavior by the driver is displayed in the second manner.

When the behavior to be executed next, is determined to be “overtake”, vehicle controller 7 reads characteristic amounts corresponding to the behavior of “overtake” included in the driving characteristic model, and controls vehicle 1 such that vehicle 1 performs “acceleration” with these characteristic amounts being reflected thereon.

A description will next be given of an example of a display when the driving characteristic of the driver is not the driving characteristic of “frequently decelerating”.

FIG. 26 is a view for describing a display on notification unit 92 according to the fourth exemplary embodiment of the present invention. FIG. 26 is a view illustrating a display in response to the first example of the travel environment illustrated in FIG. 5. It is to be noted that part (a) of FIG. 26 illustrates an example of a case where the driver has a driving characteristic of “frequently accelerating”, and part (b) of FIG. 26 illustrates an example of a case where the driver has a driving characteristic of “frequently performing a lane change”.

In part (a) of FIG. 26, symbol 261 indicating that the driver has a driving characteristic of “frequently accelerating” is illustrated. Symbol 262 indicating “acceleration” which is the first behavior is also illustrated in the first manner (for example, in the first color). Symbol 263 indicating “lane change” which is the second behavior and symbol 264 indicating “deceleration” which is the second behavior are also illustrated.

Vehicle controller 7 causes notification unit 92 to execute a display including symbol 261 as illustrated in part (a) of FIG. 26 for the driver who has frequently “accelerated” previously (that is, the driver who has frequently selected the behavior of “acceleration” previously) based on the driving characteristic, for example. In addition, vehicle controller 7 determines the first behavior as “acceleration” and causes notification unit 92 to execute the display in part (a) of FIG. 26 based on the driver's driving characteristic of “frequently accelerating”.

In part (b) of FIG. 26, symbol 265 indicating that the driver has a driving characteristic of “frequently performing a lane change” is illustrated. Symbol 266 indicating “lane change” which is the first behavior is also illustrated in the first manner (for example, in the first color). Symbol 267 indicating “acceleration” which is the second behavior and symbol 268 indicating “deceleration” which is the second behavior are also illustrated.

Vehicle controller 7 causes notification unit 92 to execute a display including symbol 265 as illustrated in part (b) of FIG. 26 for the driver who has frequently performed “lane change” previously (that is, the driver who has frequently selected the behavior of “lane change” previously) based on the driving characteristic, for example. Vehicle controller 7 determines the first behavior as “lane change” and causes notification unit 92 to execute the display in part (b) of FIG. 26 based on the driver's driving characteristic of “frequently performing a lane change”.

The description has been given only using the driving characteristic model. However, the driver model may also be considered, and symbol 231 in FIGS. 23 and 25, and symbols 261, 265 in FIG. 26 may indicate the type of the driver model selected based on the operation history of the driver. For example, for the driver model to be applied to a driver frequently selecting “deceleration” for the first example of the travel environment illustrated in FIG. 5, vehicle controller 7 causes notification unit 92 to execute the display including symbol 231 as in FIG. 23 and determines the first behavior as “deceleration”. For the driver model to be applied to a driver frequently selecting “acceleration”, vehicle controller 7 causes notification unit 92 to execute the display including symbol 261 as in part (a) of FIG. 26 and determines the first behavior as “acceleration”. For the driver model to be applied to a driver frequently selecting “lane change”, vehicle controller 7 causes notification unit 92 to execute the display including symbol 265 as in part (b) of FIG. 26 and determines the first behavior as “lane change”.

According to the present exemplary embodiment described above, when determining a future behavior of the vehicle, the vehicle can learn the previous travel history of the driver and use the result for the determination of the future behavior. In addition, when controlling the vehicle, the vehicle controller can learn the driving characteristic (driving preference) of the driver and use the result for the control of the vehicle.

Thus, the vehicle can control the autonomous driving at a timing or with an operation amount preferred by the driver or the occupant, thereby being capable of suppressing unnecessary operation intervention of the driver during the autonomous driving without causing deviation from a sense of the driver when he/she actually manually drives the vehicle.

Note that, in the present invention, the function similar to the function executed by vehicle controller 7 may be executed by a cloud server or a server device. In addition, storage unit 8 may be provided in the cloud server or the server device, not in vehicle 1. Alternatively, storage unit 8 may store a driver model which has already been constructed, and vehicle controller 7 may determine a behavior by referring to the driver model stored in storage unit 8.

As described above, in the fourth exemplary embodiment, vehicle controller 7 acquires the in formation about the characteristic amount indicating the driving characteristic of the driver; storage unit 8 stores the information about the characteristic amount; and vehicle controller 7 constructs, for each travel environment of the vehicle, the driver model which indicates the tendency of the behavior of the vehicle selected by the driver in terms of the frequency of the selected behavior, based on the information about the characteristic amount stored in storage unit 8.

In addition, vehicle controller 7 determines, among from a plurality of drivers, the group of the drivers having similar behavior selection, and constructs the driver model for each group or each travel environment of the vehicle.

Further vehicle controller 7 calculates the average of the frequency of the behavior selected by each driver for each group of the drivers performing a similar operation, and constructs, for each travel environment of the vehicle, a driver model in which the tendency of the behavior of the vehicle selected by the driver is indicated in terms of the calculated average.

Moreover, vehicle controller 7 constructs, based on the vehicle behavior which is selected by another driver having a similar tendency to the vehicle behavior selected by a specific driver, a driver model in which the tendency of the vehicle behavior selected by the specific driver is indicated in terms of the frequency of each selected behavior, for each travel environment of the vehicle.

Accordingly, vehicle controller 7 can construct a driver model more suitable for the driving tendency of the driver, and can perform autonomous driving more appropriate for the driver based on the constructed driver model.

(Modification of Driver Model)

The driver model described above is constructed in such a way that the operation (behavior) tendency of a driver for each travel environment is modeled based on information relating to the frequency of each operation. However, the present invention is not limited thereto.

For example, the driver model may be constructed based on a travel history in which an environmental parameter indicating a travel environment (i.e., situation) through which the vehicle has previously traveled and the operation (behavior) actually selected by the driver in this travel environment are associated with each other. When the environmental parameter is incorporated into the driver model, options can be determined without going through the procedure for individually performing detection and labeling of the travel environment and inputting (storing) the labeling result in the driver model. Specifically; when the difference between travel environments shown in FIGS. 23 and 24 is acquired as environmental parameters, and the acquired parameters are directly input (stored) in the driver model, “acceleration”, “deceleration”, and “lane change” are determined as options in FIG. 23, and “acceleration” and “deceleration” are determined as options in FIG. 24. Hereinafter, an example of constructing such a driver model will be described. Note that the driver model described below may be restated as a situation database.

Now, a travel history for constructing the driver model in the present modification will be described. FIG. 27 is a diagram showing one example of the travel history. FIG. 27 shows the travel history in which environmental parameters indicating a travel environment through which the vehicle driven by driver x has previously traveled and the operation (behavior) actually selected by the driver in this travel environment are associated with each other.

The environmental parameters in (a) to (c) in the travel history in FIG. 27 respectively indicate the travel environments when the vehicle behavior is presented to the driver as in part (b) of FIG. 8, part (b) of FIG. 5, and part (b) of FIG. 7, for example. The environmental parameters in the travel history are acquired from sensing information or infrastructure information.

The sensing information indicates information detected by sensors or radars in the vehicle. The infrastructure information includes information from GPS, map information, and information acquired through road-to-vehicle communication, for example.

For example, the environmental parameters in the travel history in FIG. 27 include; “host vehicle information”; “preceding vehicle information” indicating information about a vehicle traveling in front of host vehicle a in a lane of host vehicle a; “adjacent lane information” indicating information about an adjacent lane of the lane in which the host vehicle is traveling; “merging lane information” indicating, when there is a merging lane on a location where the host vehicle travels, the information about the merging lane; and “location information” indicating information about the location of the host vehicle and the surrounding of the host vehicle. In addition, following vehicle information may be included. In this case, a relative speed of the following vehicle relative to the host vehicle, head-to-head spacing, rate of change of the head-to-head spacing, and the like may be used. In addition, vehicle presence information may be included.

For example, the “host vehicle information” includes information about speed Va of the host vehicle. The “preceding vehicle information” includes information about relative speed Vba of preceding vehicle b relative to the host vehicle, distance DRba between the preceding vehicle and the host vehicle, and rate of change RSb of the size of the preceding vehicle.

Here, speed Va of the host vehicle is detected by a speed sensor mounted to the host vehicle. Relative speed Vba and distance DRba between the host vehicle and the preceding vehicle are detected by a sensor, radar, or the like. Rate of change RSb of the size is calculated from a relational expression RSb=−Vba/DRba.

The “adjacent lane information” includes information about adjacent following vehicle c traveling behind the host vehicle in the adjacent lane, information about adjacent preceding vehicle d traveling in front of the host vehicle in the adjacent lane, and information about remaining adjacent lane length DRda for the host vehicle.

The adjacent following vehicle information includes information about relative speed Vca of the adjacent following vehicle relative to the host vehicle, head-to-head spacing Dca between the adjacent following vehicle and the host vehicle, and rate of change Rca of the head-to-head spacing. Head-to-head spacing Dca between the adjacent following vehicle and the host vehicle is the distance between the front part (head) of the host vehicle and the front part (head) of the adjacent following vehicle measured in the direction along the travel direction of the host vehicle (and the adjacent following vehicle). Note that the head-to-head spacing may be calculated from an inter-vehicular distance or vehicle length. In addition, the head-to-head spacing may be replaced by an inter-vehicular distance.

Here, relative speed Vca and head-to-head spacing Dca are detected by a sensor, radar, or the like. Rate of change Rca of the head-to-head spacing is calculated from a relational expression Rca=Vca/Dca.

In addition, the adjacent preceding vehicle information includes information about relative speed Vda of the adjacent preceding vehicle relative to the host vehicle, head-to-head spacing Dda between the adjacent preceding vehicle and the host vehicle, and rate of change Rda of the head-to-head spacing. Head-to-head spacing Dda between the adjacent preceding vehicle and the host vehicle is the distance between the front part (head) of the host vehicle and the front part (head) of the adjacent preceding vehicle measured along the travel direction of the host vehicle (and the adjacent preceding vehicle).

Relative speed Vda and head-to-head spacing Dda are detected by a sensor, radar, or the like. In addition, rate of change Rda of the head-to-head spacing is calculated from a relational expression Rda=Vda/Dda.

Remaining adjacent lane length DRda for the host vehicle is a parameter indicating the degree of possibility of a lane change to the adjacent lane. Specifically, when the distance between the front part (head) of the host vehicle and the rear part of the adjacent preceding vehicle measured along the travel direction of the host vehicle (and the adjacent preceding vehicle) is longer than distance DRba between the preceding vehicle and the host vehicle, remaining adjacent lane length DRda for the host vehicle is the distance between the front part (head) of the host vehicle and the rear part of the adjacent preceding vehicle, and when the distance between the front part (head) of the host vehicle and the rear part of the adjacent preceding vehicle is shorter than DRba, remaining adjacent lane length DRda is DRba. Remaining adjacent lane length DRda for the host vehicle is detected by a sensor, radar, or the like.

The “merging lane information” includes information about relative speed Vma of a merging vehicle relative to the host vehicle, head-to-head spacing Dma between the merging vehicle and the host vehicle, and rate of change Rma of the head-to-head spacing. Head-to-head spacing Dma between the merging vehicle and the host vehicle is the distance between the front part (head) of the host vehicle and the front part (head) of the merging vehicle measured in the direction along the travel direction of the host vehicle (and the merging vehicle).

Relative speed Vma and head-to-head spacing Dma are detected by a sensor, radar, or the like. Rate of change Rma of the head-to-head spacing is calculated from a relational expression Rma=Vma/Dma.

In the example of the travel history shown in FIG. 27, the numerical values of the speed, distance, and rate of change described above are classified into a plurality of levels, and the numerical values indicating the classified levels are stored. Note that the numerical values of the speed, distance, and rate of change may be stored without being classified into levels.

The location information includes, for example, “host vehicle location information”, “number of travel lanes”, “host vehicle travel lane”, “distance to start/end point of merging section”, “distance to start/end point of branch section”, “distance to start/end point of road work section”, “distance to start/end point of lane end section”, and “distance to accident spot”. FIG. 27 shows, as examples of the location information, the “host vehicle travel lane” (travel lane in FIG. 27) and the “distance to start/end point of merging section” (shown as “distance to merging point” in FIG. 27).

For example, numerical information indicating the latitude and longitude acquired from the GPS is stored in the field of the “host vehicle location information” which is not shown. The number of travel lanes in the road where the host vehicle is traveling is stored in the field of the “number of travel lanes” which is not shown. Numerical information indicating the location of the lane where the host vehicle is traveling is stored in the field of the “host vehicle travel lane”. When there are start and end points of a merging section within a predetermined distance, the distances to the start and end points of the merging section are classified into a plurality of predetermined levels, and the numerical values of the classified levels are stored in the field of the “distance to start/end point of merging section”. When there are no start and end points of a merging section within the predetermined distance, “0” is stored in the field of the “distance to start/end point of merging section”.

When there are start and end points of a branch section within a predetermined distance, the distances to the start and end points of the branch section are classified into a plurality of predetermined levels, and the numerical values of the classified levels are stored in the field of the “distance to start/end point of branch section”. When there are no start and end points of a branch section within the predetermined distance, “0” is stored in the field of the “distance to start/end point of branch section”. When there are start and end points of a road work section within a predetermined distance, the distances to the start and end points of the road work section are classified into a plurality of predetermined levels, and the numerical values of the classified levels are stored in the field of the “distance to startle d point of road work section”. When there are no start and end points of a road work section within the predetermined distance, “0” is stored in the field of the “distance to start/end point of road work section”.

When there are start and end points of a lane end section within a predetermined distance, the distances to the start and end points of the lane end section are classified into a plurality of predetermined levels, and the numerical values of the classified levels are stored in the field of the “distance to start/end point of lane end section”. When there are no start and end points of a lane end section within the predetermined distance, “0” is stored in the field of the “distance to start/end point of lane end section”.

When there is an accident spot within a predetermined distance, the distance to the accident spot is classified into a plurality of predetermined levels, and a numerical value of the classified level is stored in the field of the “distance to accident spot”. When there is no accident spot within the predetermined distance, “0” is stored in the field of the “distance to accident spot”.

In addition, the location information may include information indicating which lane, out of all lanes on the road where the host vehicle is traveling, is the merging lane, the branch lane, the lane having a road work, the lane which ends, and the lane having an accident spot.

Note that the travel history shown in FIG. 27 is merely one example, and the present invention is not limited thereto. For example, when the adjacent lane information is information about the right adjacent lane, the travel history may further include “left adjacent lane information” opposite to the right adjacent lane.

The “left adjacent lane information” includes information about a left adjacent following vehicle traveling behind the host vehicle in the left adjacent lane, information about a left adjacent preceding vehicle traveling in front of the host vehicle in the left adjacent lane, and information about remaining left adjacent lane length DRda for the host vehicle.

The left adjacent following vehicle information includes information about relative speed Vfa of the left adjacent following vehicle relative to the host vehicle, head-to-head spacing Dfa between the left adjacent following vehicle and the host vehicle, and rate of change Rfa of the head-to-head spacing. Head-to-head spacing Dfa between the left adjacent following vehicle and the host vehicle is the distance between the front part (head) of the host vehicle and the front part (head) of the left adjacent following vehicle measured in the direction along the travel direction of the host vehicle (and the left adjacent following vehicle).

Here, relative speed Vfa and head-to-head spacing Dfa are detected by a sensor, radar, or the like. In addition, rate of change Rfa of the head-to-head spacing is calculated from a relational expression Rfa=Vfa/Dfa.

In addition, the left adjacent preceding vehicle information includes information about relative speed Vga of the left adjacent preceding vehicle relative to the host vehicle, head-to-head spacing Dga between the left adjacent preceding vehicle and the host vehicle, and rate of change Rga of the head-to-head spacing. Head-to-head spacing Dga between the left adjacent preceding vehicle and the host vehicle is the distance between the front part (head) of the host vehicle and the front part (head) of the left adjacent preceding vehicle measured along the travel direction of the host vehicle (and the left adjacent preceding vehicle).

Here, relative speed Vga and head-to-head spacing Dga are detected by a sensor, radar, or the like. In addition, rate of change Rga of the head-to-head spacing is calculated from a relational expression Rga=Vga/Dga.

It is to be noted that, while the description has been given of the case where the vehicle is in the left side of the road, the similar process is also applied for the case where the vehicle is in the right side of the road by inverting left to right.

In addition, the travel history shown in FIG. 27 may include “following vehicle information” indicating information about hide traveling behind the host vehicle in the travel lane of the host vehicle.

The following vehicle information includes information about relative speed Vea of the following vehicle relative to the host vehicle, head-to-head spacing Dea between the following vehicle and the host vehicle, and rate of change Rea of the head-to-head spacing. Head-to-head spacing Dea between the following vehicle and the host vehicle is the distance between the front part (head) of the host vehicle and the front part (head) of the following vehicle measured in the direction along the travel direction of the host vehicle (and the following vehicle).

Here, relative speed head-to-head spacing Dea are detected by a sensor, radar, or the like. Rate of change Rea of the head-to-head spacing is calculated from a relational expression Rea=Vea/Dea.

It is to be noted that, if the head-to-head spacing cannot be measured because of the vehicles being hidden by a moving body, the measurable distance between vehicles or an approximate value obtained by adding a predetermined vehicle length to the distance between vehicles may be substituted for the head-to-head spacing, or the head-to-head spacing may be calculated by adding the vehicle length of each recognized vehicle type to the distance between vehicles. Alternatively, regardless of whether the head-to-head spacing can be measured, the measurable distance between vehicles or an approximate value obtained by adding a predetermined vehicle length to the distance between vehicles may be substituted for the head-to-head spacing, or the head-to-head spacing may be calculated by adding the vehicle length of each recognized vehicle type to the distance between vehicles.

The travel history may include various types of other information pertaining to the travel environment of the vehicle. For example, the travel history may include information about the size or the type of a preceding vehicle, an adjacent vehicle, or a merging vehicle, and relative position of such vehicle relative to the host vehicle. For example, when the vehicle approaching from behind is an emergency vehicle as a result of recognition of the type of the vehicle by a camera sensor, information indicating the vehicle being an emergency vehicle may be included. According to this configuration, notification regarding information for responding to the emergency vehicle can be provided. Alternatively, numerical values indicating, in stages, operation amounts of the steering wheel, the brake, and the accelerator or the information pertaining to a fellow passenger as described with reference to FIG. 22 may be included in the travel history.

In addition, the travel history of the driver may be formed by aggregating the behaviors selected during autonomous driving, or by aggregating the behaviors actually executed by the driver during manual driving. Thus, a travel history can be collected according to a driving state, i.e., autonomous driving or manual driving.

Further, although the environmental parameters included in the travel history in the example in FIG. 27 show the travel environment when a vehicle behavior is presented to the driver, the environmental parameters may show travel environment when the driver performs behavior selection. Alternatively, the travel history may include both environmental parameters showing the travel environment when a vehicle behavior is presented to the driver and environmental parameters showing the travel environment when the driver performs behavior selection.

Moreover, the following configuration may be applied when vehicle controller 7 generates the display of the overhead view illustrated in part (a) of FIG. 2, part (a) of FIG. 5, part (a) of FIG. 6, part (a) of FIG. 7, part (a) of FIG. 8, part (a) of FIG. 9, or part (a) of FIG. 10 or the display illustrated in part (c) of FIG. 14. Specifically, vehicle controller 7 may generate, as one notification information item, the information about the environmental parameter having a high rate of contribution by which the first behavior and the second behavior are selected, and/or the information (for example, icon) pertaining to this environmental parameter, and may cause notification unit 92 to provide the generated notification information such that, for example, the generated notification information is displayed in the overhead view.

In this case, if distance DRba between the preceding vehicle and the host vehicle or rate of change, RSb of the size of the preceding vehicle has a high rate of contribution, for example, vehicle controller 7 may cause notification unit 92 to display a high luminance region or a color-changed region between the preceding vehicle and the host vehicle in the overhead view so as to provide the notification information.

Alternatively, vehicle controller 7 may display, as the notification information, an icon indicating that distance DRba or rate of change RSb has a high rate of contribution, in a region between the preceding vehicle and the host vehicle. Still alternatively, vehicle controller 7 may cause notification unit 92 to depict, as the notification information, a line segment connecting the preceding vehicle and the host vehicle in the overhead view, or to depict line segments connecting all surrounding vehicles and the host vehicle as the notification information and to highlight only the line segment connecting the preceding vehicle and the host vehicle in the overhead view.

Alternatively, vehicle controller 7 may cause notification unit 92 to display, as the notification information, a region having higher luminance than the surrounding region or a region having a different color from the surrounding region between the preceding vehicle and the host vehicle, not in the overhead view, but in a viewpoint image viewed by the driver, thereby implementing augmented reality (AR) display. Alternatively, vehicle controller 7 may cause notification unit 92 to display; as the notification information, an AR image of an icon indicating an environmental parameter having a high rate of contribution in a region between the preceding vehicle and the host vehicle in the viewpoint image.

Still alternatively, vehicle controller 7 may cause notification unit 92 to display, as the notification information, an AR image of a line segment connecting the preceding vehicle and the host vehicle in the viewpoint image, or to display, as the notification information, an AR image of line segments connecting all surrounding vehicles and the host vehicle and to highlight only the line segment connecting the preceding vehicle and the host vehicle in the viewpoint image.

It should be noted that the method for providing notification regarding the environmental parameter having a high rate of contribution or the information pertaining to the environmental parameter is not limited to the methods described above. For example, vehicle controller 7 may generate, as the notification information, an image in which the preceding vehicle involved with an environmental parameter having a high rate of contribution is displayed in a highlighted manner, and may cause notification unit 92 to display this image.

Alternatively, vehicle controller 7 may generate, as the notification information, information indicating the direction of the preceding vehicle or the like involved with an environmental parameter having a high rate of contribution, and display this information in the host vehicle or around the host vehicle in the overhead view or AR display.

Still alternatively, in place of providing the notification regarding the information about the environmental parameter having a high rate of contribution or the information pertaining to this environmental parameter, vehicle controller 7 may lower the display luminance of a preceding vehicle or the like, which is involved with an e mental parameter having a low rate of contribution, to make this vehicle unnoticeable, generate, as the notification information, the information about the environmental parameter having a high rate of contribution which becomes relatively noticeable or the information pertaining to the environmental parameter, and cause notification unit 92 to display the generated information, for example.

Next, the construction of a driver model based on the travel history of the driver will be described. The driver model is classified into a clustering type constructed by clustering travel histories of a plurality of drivers, and an individually-adapted type in which a driver model of a specific driver (for example, driver x) is constructed from a plurality of travel histories similar to the travel history of driver x.

Firstly, the clustering type will be described. The clustering-type driver model is constructed in such a way that the travel history of the driver shown in FIG. 27 is aggregated in advance for each driver. Then, a plurality of drivers having a high degree of similarity between the travel histories, that is, a plurality of drivers having a similar driving operation tendency, is grouped to construct a driver model.

The degree of similarity between travel histories can be determined, for example, based on a correlation value of a vector having, when the behaviors in the travel histories of driver a and driver b are quantified according to a predetermined rule, the numerical value of the environmental parameter and the numerical value of the behavior as an element. In this case, when the correlation value calculated from the travel histories of driver a and driver b is higher than a predetermined value, for example, the travel histories of driver a and driver b are grouped into a single group. Note that the calculation of the degree of similarity is not limited thereto.

Next, the individually-adapted type will be described. The individually-adapted-type driver model is constructed in such a way that travel histories of a plurality of drivers shown in FIG. 27 are aggregated in advance, as in the method for constructing the clustering-type. The individually-adapted type driver model is different from the clustering type in that the individually-adapted type driver model is constructed for each driver. For example, when a driver model is constructed for driver y, the travel history of driver y and travel histories of the other drivers are compared, and the travel histories of the drivers having a high degree of similarity are extracted. Then, the individually-adapted-type driver model for driver y is constructed based on the extracted travel histories of a plurality of drivers.

Notably, the driver model (situation database) based on the travel history in FIG. 27 is not limited to the clustering type or the individually-adapted type, and may be constructed to include travel histories of all driver for example.

Now, a method for using the constructed driver model will be described with examples. A description will next be given of a case where a driver model formed by aggregating travel histories of four drivers a to d is used for driver x. Note that the driver model is constructed by vehicle controller 7.

FIG. 28 is a diagram showing a method for using the driver model in the present modification. Part (a) of FIG. 28 shows environmental parameters indicating the current travel environment of the vehicle driven by driver x. Part (b) of FIG. 28 shows one example of a driver model for driver x.

As shown in part (a) of FIG. 28, the field of the behavior (operation) for the environmental parameters indicating the current travel environment is blank. Vehicle controller 7 acquires environmental parameters at predetermined intervals, and determines the next behavior based on the driver model shown in part (b) of FIG. 28 by using any one of the environmental parameters as a trigger.

For example, the environmental parameter indicating a situation where there is a need to change the operation of the vehicle may be used as a trigger. Examples of such situation include the case where the distance to the start point of the merging section becomes shorter than or equal to a predetermined distance or the case where the speed relative to the preceding vehicle becomes less than or equal to a predetermined value.

Vehicle controller 7 compares the environmental parameters shown in part (a) of FIG. 28 with the environmental parameters in the travel history of the driver model shown in part (b) of FIG. 28, and determines the behavior associated with the most similar environmental parameters as the first behavior. In addition, vehicle controller determines some behaviors associated with the other similar environmental parameters as the second behavior.

The similarity between environmental parameters a determined based on a correlation value of a vector having the numerical values of the environmental parameters as elements. For example, when the correlation value calculated from the vector having the numerical values of the environmental parameters shown in part (a) of FIG. 28 as an element and the vector having the numerical values of the environmental parameters in part (b) of FIG. 28 as an element is larger than a predetermined value, these environmental parameters are determined to be similar to each other. Note that the method for determining similarity between environmental parameters is not limited thereto.

In the above, a behavior is determined based on the degree of similarity between environmental parameters. However, for example, a group of environmental parameters having a high degree of similarity may be firstly generated, statistics of the environmental parameters in this group may be taken, and a behavior may be determined based on this statistical data.

In this way, the notification regarding the behavior more suitable for the driver can be provided by constructing in advance a personal driver model of the driver based on the travel histories of a plurality of drivers. Notably, to register a safer travel history into a database, it may be configured such that: storage unit 8 stores information indicating a safe travel standard; vehicle controller 7 determines whether or not the travel history satisfies this standard; and vehicle controller 7 further registers the travel history satisfying this standard into the database and does not register the travel history not satisfying this standard into the database.

In addition, due to the association between the parameter indicating the travel environment and the behavior, vehicle controller 7 can determine the next behavior with high accuracy without determining a specific travel environment, i.e., without performing labeling of travel environments.

It is to be noted that the driver model (situation database) may be constructed based on the travel history in which the behavior selected by the driver during autonomous driving and the environmental parameters indicating the travel environment when this behavior is presented are associated with each other. Alternatively, the driver model (situation database) may be constructed based on the travel history in which the behavior selected by the driver during autonomous driving and the environmental parameters indicating the travel environment when the vehicle performs this behavior are associated with each other.

When the environmental parameters indicate the travel environment when the vehicle performs the behavior selected by the driver, environmental parameters indicating a future travel environment are predicted based on the environmental parameters indicating the current travel environment. Then, from among the environmental parameters indicating the travel environment when the vehicle performs the behavior selected by the driver, the behavior associated with the environmental parameter most similar to the predicted environmental parameters may be determined as the first behavior, and some behaviors associated with the other similar environmental parameters may be determined as the second behavior.

For example, the above prediction is conducted by extrapolating the environmental parameters in the future from the environmental parameters indicating the travel environments at the present moment and before the present moment.

Alternatively, the driver model (situation database) may be constructed based on both the travel history in which the behavior selected by the driver during autonomous driving and the environmental parameters indicating the travel environment when this behavior is presented are associated with each other, and the travel history in which the behavior selected by the driver during autonomous driving and the environmental parameters indicating the travel environment when the vehicle performs this behavior are associated with each other.

In this case, both of the travel histories are stored in the form shown in part (b) of FIG. 28, for example, and vehicle controller 7 determines the next behavior based on these travel histories. In this case, vehicle controller 7 may prioritize both travel histories, and may determine the next behavior by preferentially using the travel history in which the behavior selected by the driver during autonomous driving and the environmental parameters indicating the travel environment when the vehicle performs this behavior are associated with each other, for example.

Note that, in the present invention, the function similar to the function executed by vehicle controller 7 may be executed by a cloud server or a server device. Particularly storage unit 8 may be mounted in a server device such as a cloud server, not in vehicle 1, because it has an enormous amount of data with accumulation of travel histories. Alternatively, storage unit 8 may store a driver model which has already been constructed, and vehicle controller 7 may determine a behavior by referring to the driver model stored in storage unit 8.

It is to be noted that, in the configuration in which storage unit 8 is mounted in a cloud server, a cache is desirably provided in case of storage unit 8 being inaccessible due to a drop in a communication speed or disruption of communication.

FIG. 29 is a block diagram showing one example of a cache arrangement. Vehicle controller 7 causes storage unit 8 to store the travel history through communication unit 291, and causes cache 292 to store a portion of the driver model (situation database) stored in storage unit 8 through commutation unit 291.

Vehicle controller 7 accesses the driver model in cache 292. Conceivable methods for creating a cache in this case include a method for limitation according to presence or absence of an environmental parameter, a method using location information, and a method for processing data. Each of the methods will be described below.

Firstly, the method for limitation according to presence or absence of an environmental parameter will be described. It is possible to extract similar situations through comparison with surrounding situations, if there are sufficient travel environments (situations) having only the same environmental parameters. Therefore, vehicle controller 7 extracts travel environments having only the same environmental parameters from among the travel environments stored in storage unit 8, sorts these travel environments, and holds the resultant in cache 292.

In this case, vehicle controller 7 updates a primary cache at the timing at which the environmental parameters acquired from the detected situation are changed. According to this process, vehicle controller 7 can extract similar surrounding situations even if the communication speed drops. Notably, the environmental parameters which are determined to be changed may be all environmental parameters or some of the environmental parameters described previously.

Moreover, because the environmental parameters vary from hour to hour, a primary cache and a secondary cache may be prepared in cache 292. For example, vehicle controller 7 holds travel environments having the same environmental parameters in the primary cache. Further, vehicle controller 7 holds, in the secondary cache, a travel environment in which one environmental parameter is added to the travel environment held in the primary cache and/or a travel environment in which one environmental parameter is reduced from the travel environment held in the primary cache.

Accordingly, vehicle controller 7 can extract a similar situation by using only the data in cache 292, even if temporal communication disruption occurs.

This case will be more specifically described reference to FIG. 30. When sensor 62 detects surrounding situation 303 in which only adjacent preceding vehicle 302 is present around host vehicle 301, vehicle controller 7 extracts travel environments (travel environments having the same environmental parameters) where only adjacent preceding vehicle 302 is present, from storage unit 8 in which all travel environments (situations) are stored, and stores the extracted travel environments in primary cache 304.

Vehicle controller 7 also extracts a travel environment where only one vehicle other than adjacent preceding vehicle 302 is added (travel environment where one environmental parameter is added to the same environmental parameter) or a travel environment where there is no adjacent preceding vehicle 302 (travel environment where one environmental parameter is reduced from the same environmental parameters) from storage unit 8, and stores the extracted travel environments in secondary cache 305.

When surrounding situation 303 detected by sensor 62 is changed, vehicle controller 7 copies the travel environment corresponding to changed surrounding situation 303 to primary cache 304 from secondary cache 305, extracts, from storage unit 8, a travel environment where one environmental parameter is added and a travel environment where one environmental parameter is reduced relative to the travel environment corresponding to changed surrounding situation 303, and stores the extracted travel environments into secondary cache 305. Thus, vehicle controller 7 updates secondary cache 305. Accordingly, vehicle controller 7 can smoothly extract more similar surrounding situation through comparison with the surrounding situations.

Next, the method using location information will be described. When location information is included in environmental parameters, vehicle controller 7 can extract, from storage unit 8, the travel environment (situation) where the location indicated by the location information is included within a certain range around the location of the host vehicle, and store the extracted travel environment in cache 292.

In this case, vehicle controller 7 updates cache 292 when the location indicated by the location information corresponding to the travel environment falls outside the certain range. Accordingly, vehicle controller 7 can extract a similar surrounding situation as long as the location falls within a certain range, even if long-term communication disruption occurs.

Next, the method for processing data will be described. Operation histories including environmental parameters are accumulated in storage unit 8. Vehicle controller 7 divides the respective environmental parameters for each predetermined range to form a mesh on a multidimensional space. Then, vehicle controller 7 creates a table in which behaviors included in each mesh are counted for each type.

A description will be given of the case where the environmental parameters to be used are limited to two, for example. Vehicle controller 7 maps the environmental parameters included in the operation history on a plane as shown in part (a) of FIG. 31, and each axis is equally divided, whereby the plane is divided into a plurality of blocks. Each block is called a mesh.

Vehicle controller 7 counts the number of behaviors included in each mesh for each type (for example, the type such as acceleration, deceleration, lane change, or overtake). Part (b) of FIG. 31 shows a table where the number of behaviors included in each mesh is counted for each type.

Vehicle controller 7 stores this content in cache 292. Then, when extracting a similar surrounding situation through the comparison with surrounding situations, vehicle controller 7 determines in which mesh the detected environmental parameter is located, selects the behavior having the highest number from the behaviors included in the determined mesh, and determines the selected behavior as the behavior to be provided as notification.

For example, when determining that the detected environmental parameter is in No. 3 mesh, vehicle controller 7 determines operation of the behavior (here, “acceleration”) showing the highest number among the behaviors included in the No. 3 mesh as the behavior to be provided as notification. If this method is used, cache 292 can be updated at any timing, and the capacity of cache 292 can be made constant.

The cache is created by using one of these methods or a combination thereof. It is to be noted that the methods described above are merely one example, and the method for creating a cache is not limited thereto.

As described above, in the example of extending the driver model in the fourth exemplary embodiment, vehicle controller 7 acquires information about characteristic amounts indicating a driver's driving characteristic including information about a previous travel environment, storage unit 8 stores the information about the characteristic amounts, and when it is determined that a vehicle behavior is needed to be changed, vehicle controller 7 determines information similar to characteristic amounts indicating the driver's driving characteristic including information about a newly-acquired travel environment, from the information about characteristic amounts stored in storage unit 8, and provides notification regarding the behavior corresponding to the determined information.

In addition, in the example of extending the driver model according to the fourth exemplary embodiment, the information about characteristic amounts indicating the driver's driving characteristic including the information about the previous travel environment is information about characteristic amounts when a vehicle behavior is presented to the driver and/or information about characteristic mounts when the driver performs behavior selection.

In addition, in the example of extending the driver model according to the fourth exemplary embodiment, when the information about characteristic amounts indicating the driver's driving characteristic including the information about the previous travel environment is both the information about characteristic amounts when a vehicle behavior is presented to the driver and the information about characteristic amounts when the driver performs behavior selection, vehicle controller 7 determines information similar to characteristic amounts indicating the driver's driving characteristic including information about a newly-acquired travel environment, from both information items about characteristic amounts, and provides notification regarding the behavior corresponding to the determined information.

In addition, in the example of extending the driver model according to the fourth exemplary embodiment, when the information about characteristic amounts indicating the driver's driving characteristic including the information about the previous travel environment is both the information about characteristic amounts when a vehicle behavior is presented to the driver and the information about characteristic amounts when the driver performs behavior selection, vehicle controller 7 determines information similar to characteristic amounts indicating the driver's driving characteristic including information about a newly-acquired travel environment, preferentially from the information about characteristic amounts when the driver performs behavior selection, and provides notification regarding the behavior corresponding to the determined information.

In addition, in the example of extending the driver model according to the fourth exemplary embodiment, the information about characteristic amounts indicating the driver's driving characteristic including the information about the previous travel environment is information about characteristic amounts indicating the driver's driving characteristic when the vehicle is under one or both of autonomous driving and manual driving.

Accordingly, vehicle controller 7 can construct a driver model more suitable for the driving tendency of the driver, and can perform autonomous driving more appropriate for the driver based on the constructed driver model. Due to the association between parameters indicating the travel environment and the behavior, vehicle controller 7 can determine the next, behavior with high accuracy without requiring a process for determining a specific travel environment, i.e., without performing labeling of travel environments.

Fifth Exemplary Embodiment

Hereinafter, a fifth exemplary embodiment will be described. The above-mentioned exemplary embodiments have described a method for predicting a driver's driving behavior. Meanwhile, the present exemplary embodiment will describe vehicle speed control, inter-vehicular distance control, and acceleration rate control. Regarding a vehicle speed, an inter-vehicular distance, and an acceleration rate, driving characteristics (driving tendency) of a driver during manual driving are collected, and the collected characteristics are reflected during autonomous driving.

This will be described in more details with reference to FIG. 32. Firstly, a method for collecting data during manual driving will be described.

(Collection of Vehicle Speed)

Vehicle behavior detector 282 in the present exemplary embodiment acquires speed information (vehicle speed) of the host vehicle from speed information acquisition unit 63 during manual driving, and detects the presence/absence of a preceding vehicle by sensor 62. When detecting no preceding vehicle and detecting that the host vehicle is turned into a constant-speed travel state, vehicle behavior detector 282 stores the vehicle speed and the environmental parameters at this moment into storage units 8, 8 a. For example, as shown in FIG. 33, vehicle behavior detector 282 obtains a speed change, that is, an acceleration rate, and determines a travel state where the state in which the acceleration rate falls within a certain range (threshold±A1) continues for T1 second as a constant-speed travel state. Then, vehicle behavior detector 282 acquires the vehicle speed and the environmental parameters upon the start of the constant-speed travel state, stores the obtained speed and parameters into storage units 8, 8 a, and again starts searching the constant-speed travel state. By repeating such a process, vehicle behavior detector 282 accumulates information into storage units 8, 8 a. The environmental parameters are the parameters described in the fourth exemplary embodiment, and they are inter-vehicular distances and relative change rates with vehicles around the host vehicle, a number of lanes, a lane position, a lane width, and a road condition. The lane width is a value of the width of the lane acquired by a sensor or an infrastructure, and the road condition is indicated by a value showing road slipperiness acquired by a sensor or an infrastructure (for example, 0=normal condition, 1=rainy weather, and 2=icy condition).

(Collection of Inter-Vehicular Distance)

Vehicle behavior detector 282 acquires speed information of the host vehicle from speed information acquisition unit 63 during manual driving, and detects the presence/absence of a preceding vehicle by sensor 62, as described above. When detecting that there is a preceding vehicle and that the host vehicle is turned into a constant inter-vehicular distance travel state, vehicle behavior detector 282 stores the inter-vehicular distance and the environmental parameters at this moment into storage units 8, 8 a. For example, as shown in FIG. 34, vehicle behavior detector 282 obtains a change in the inter-vehicular distance, and when the state where the change in the inter-vehicular distance falls within a certain range (threshold±A2) is continued for T2 second, vehicle behavior detector 282 determines that the vehicle is turned into the constant inter-vehicular distance travel state. Then, vehicle behavior detector 282 acquires the distance between the host vehicle and the preceding vehicle and the environmental parameters upon the start of the constant inter-vehicular distance travel state, stores the obtained distance and parameters into storage units 8, 8 a, and again starts searching the constant inter-vehicular distance travel state. By repeating such a process, vehicle behavior detector 282 accumulates information into storage units 8, 8 a. The environmental parameters in this case are the speed of the host vehicle, inter-vehicular distances and relative change rates with vehicles around the host vehicle (note that the distance between the host vehicle and the preceding vehicle is excluded), a number of lanes, a lane position, a lane width, and a road condition.

(Collection of Acceleration Rate)

Vehicle behavior detector 282 acquires speed information of the host vehicle from speed information acquisition unit 63 during manual driving, and detects the presence/absence of a preceding vehicle by sensor 62. When detecting acceleration with an acceleration rate larger than or equal to a certain acceleration rate or deceleration with an acceleration rate less than or equal to a certain acceleration rate, vehicle behavior detector 282 stores acceleration rate patterns before and after the acceleration/deceleration into storage units 8, 8 a together with the environmental parameters. For example, as shown in FIG. 35, vehicle behavior detector 282 acquires the environmental parameters at the time T3 second before the time when the acceleration rate exceeds a certain threshold A3 as well as the acceleration rate pattern until the acceleration rate exceeds threshold A4 or until the speed becomes zero (when the vehicle decelerates), and stores the obtained parameters and pattern into storage units 8, 8 a. The environmental parameters during deceleration are the speed of the host vehicle, inter-vehicular distances and relative change rates with vehicles around the host vehicle (note that the distance between the host vehicle and the preceding vehicle is excluded), a number of lanes, a lane position, a lane width, a road condition, a distance to a target stop position (when the vehicle is about to stop), a distance to a next traffic signal, and a lighting state of a traffic signal. The distance to a target stop position is the distance to a target stop position when an autonomous driving system determines to stop, and in other cases, it is set to be zero. The distance to a next traffic signal is set to an actual distance to a next traffic signal when the distance to the next traffic signal is less than or equal to a certain value, and in other cases, it is set to be zero. The lighting state of a traffic signal is set such that (red=0, yellow=1, green=2), for example. It is to be noted that, as shown in FIG. 36, the acceleration rate pattern is a pattern classified according to an acceleration or deceleration period, a position of a peak of an acceleration rate, and a number of peaks, for example. Alternatively, the acceleration rate pattern indicates an average acceleration rate during deceleration or acceleration, a period in which the acceleration rate exceeds a certain threshold in such an acceleration or deceleration period, and a speed at that time.

When autonomous driving is set by a driver, autonomous driving controller 281 controls the vehicle speed, inter-vehicular distance, and acceleration rate of the vehicle according to a surrounding situation by using the information items (FIGS. 37 and 38) stored in storage units 8, 8 a. The control method therefor is similar to the method in the fourth exemplary embodiment, wherein a client uploads in advance the data stored in storage unit 8 a to a cloud through communication unit 291. The cloud compares the driving characteristic with the driving characteristics of other drivers, and creates a driver model based on a group of drivers having similar driving characteristics. In this case, a driver model may individually be created for each of the vehicle speed, the inter-vehicular distance, and the acceleration rate, or a driver model including all of these parameters may be created. The created driver model is transmitted to the client. These processes are performed at a timing such as just after an engine is started.

The driver model may be created according to the method described in the fourth exemplary embodiment. Alternatively, a model having environmental parameters as an input and a vehicle speed, an inter-vehicular distance, and an acceleration rate pattern as an output may be created by using machine learning, for example. In such a case, a combination of environmental parameters and a vehicle speed is learned from the history as supervised data. Examples of an algorithm to be used include a random forest, a support vector machine, and gradient boosting. The model obtained by learning is used as a driver model.

Further, the method described in the fourth exemplary embodiment may be applied as a method for creating a driver model by collecting drivers similar to a certain driver, and there is a method for constructing a plurality of driver models in such a way that, if a plurality of local peaks is detected in the distribution of driving characteristic (for example, vehicle speed) data on a cloud, for example, a plurality of clusters is considered to be present based on these local peaks, and a model is created considering that the distribution with each local peak being a peak thereof is regarded as one cluster. According to this method: a driver model most matching the history of the driver on the client side may be selected to estimate a vehicle speed; or a plurality of driver models having a high match rate may be used and a vehicle speed may be obtained by using the average of these driver models.

When the driver sets autonomous driving, autonomous driving controller 281 inputs environmental parameters to the driver model, and performs vehicle control according to the obtained vehicle speed, inter-vehicular distance, and acceleration/deceleration rate pattern. According to this control, there is no need for the driver to set the inter-vehicular distance or the like during autonomous driving y use of a steering switch or the like, whereby the driver can achieve autonomous driving close to his/her driving.

Summary of Fourth and Fifth Exemplary Embodiments

FIG. 39 is a diagram illustrating a configuration of an information processing system according to the fourth and fifth exemplary embodiment of the present invention.

Information processing system 1000 is provided with history acquisition unit 1001 and modeling unit 1002.

History acquisition unit 1001 acquires a personal travel history of each of a plurality of drivers. The travel history including the personal travel histories is the one illustrated in FIG. 16, 17, or 20, for example, and the personal travel history may be the travel history of driver x shown in FIG. 27. The personal travel history indicates, in association with each other, one or a plurality of vehicle behaviors selected by the driver and the travel environment of the vehicle when the one or each of the plurality of behaviors is selected. In the present exemplary embodiment, the behavior indicates a driving behavior, a driving operation, or an operating state of the vehicle. Further, the one or each of the plurality of vehicle behaviors selected by the driver is the second behavior selected by the driver during autonomous driving in the first exemplary embodiment. Alternatively, the one or each of the plurality of vehicle behaviors selected by the driver may be a behavior executed by the driver during manual driving, that is, a behavior selected during manual driving.

Modeling unit 1002 models the personal travel histories of at least one or more drivers in the travel history, thereby constructing a driver model indicating a relationship between a behavior and a travel environment of the vehicles of the at least one or more drivers. This driver model is the one shown in FIG. 18, FIG. 21, or part (b) of FIG. 28, for example.

Information processing system 1000 may also be provided with environment acquisition unit 1003 and behavior estimating unit 1004. Environment acquisition unit 1003 acquires a travel environment of a vehicle driven by an estimation target driver. The travel environment is the one illustrated in FIG. 16, 17, or 20, for example. It is to be noted that environment acquisition unit 1003 may be detector 6 illustrated in FIG. 1. That is, a travel environment may be generated based on the information detected by detector 6, and the generated travel environment may be acquired.

Behavior estimating unit 1004 estimates (or determines) a behavior associated with the travel environment acquired by environment acquisition unit 1003 in the constructed driver model as a behavior of the vehicle driven by the estimation target driver.

Thus, a behavior of the vehicle driven by the estimation target driver is estimated by using the driver model, whereby even if the personal travel history of the estimation target driver is insufficient for behavior estimation, a behavior of the vehicle driven by the driver can be appropriately estimated. That is, a driving behavior suitable for the driver can be estimated.

Herein, modeling unit 1002 may construct a clustering-type driver model. Specifically, modeling unit 1002 models, for each of groups consisting of a plurality of personal travel histories similar to one another in the travel history, the plurality of personal travel histories similar to one another, to thereby construct a driver model showing a relationship between a behavior and a travel environment of the vehicle for each model driver. Such a clustering-type driver model is the driver model shown in FIG. 18, for example.

In this case, behavior estimating unit 1004 selects, from the driver model, a model driver having a relationship of between a behavior and a travel environment similar to that of the personal travel history of the estimation target driver. Then, behavior estimating unit 1004 estimates, based on the selected model driver's relationship between the behavior and the travel environment, a behavior associated with the travel environment acquired by environment acquisition unit 1003 as a behavior of the vehicle driven by the estimation target driver.

Thus, the model driver having a relationship between a behavior and a travel environment similar to that of the personal travel history of the estimation target driver is selected, and a behavior of the vehicle driven by the estimation target driver is estimated by using the relationship of the model driver, whereby a behavior (that is, driving behavior) suitable for the driver can be estimated.

In this case, the personal travel history of each of the plurality of drivers may indicate, for each travel environment, how many times a predetermined one or each of a plurality of behaviors has been selected under the corresponding travel environment.

In this case, for each travel environment, modeling unit 1002 averages, for the predetermined one or each of the plurality of behaviors, frequencies of the behavior indicated in the plurality of personal travel histories similar to one another, thereby modeling the personal travel histories similar to one another.

Thus, the modeling can be simply and appropriately performed.

In addition, modeling unit 1002 may construct an individually adapted-type driver model. Specifically, modeling unit 1002 constructs a driver model corresponding to the estimation target driver by modeling a plurality of personal travel histories, in the travel history, similar to the personal travel history of the estimation target driver. Such an individually-adapted-type driver model is the driver model shown in FIG. 21, for example.

Thus, the plurality of personal travel histories similar to the personal travel history of the estimation target driver in the travel history is modeled, whereby a behavior (that is, driving behavior) more suitable for the driver can be estimated.

In addition, as shown in FIG. 27, the personal travel history of each the plurality of drivers may indicate a travel environment of the vehicle at the time when one or each of a plurality of behaviors is selected, as a first parameter set which is a parameter set consisting of numerical values of at least one environmental parameter.

In this case, modeling unit 1002 models the numerical values of the environmental parameters included in the first parameter set indicated by the personal travel histories of at least one or more drivers, thereby constructing a driver model indicating a relationship between a behavior and the first parameter set of the vehicles of the at least one or more drivers. The driver model constructed at this time is the driver model shown in part (b) of FIG. 28, for example. Environment acquisition unit 1003 acquires a travel environment of the vehicle driven by the estimation target driver as a parameter set. Note that this parameter set also consists of numerical values of at least one environmental parameter as in the first parameter set. Behavior estimating unit 1004 estimates behavior associated with the first parameter set similar to the parameter set acquired by environment acquisition unit 1003 in the constructed driver model, as a behavior of the vehicle driven by the estimation target driver.

Accordingly, because of a travel environment being indicated by using parameters, the travel environment can be categorised in a more detailed manner, and therefore, whatever the travel environment is, a behavior that is, driving behavior) according to the travel environment can be estimated.

Information processing system 1000 may also be provided with display unit 1005 for displaying a behavior candidate. Note that display unit 1005 may be included in notification unit 92 illustrated in FIG. 1. In addition, the personal travel history of each of the plurality of drivers may further indicate, for each vehicle behavior selected by the driver, a second parameter set as a travel environment at the time when the behavior is displayed as a candidate, in association with the behavior. The second parameter set is a parameter set consisting of numerical values of at least one environmental parameter. Specifically, the personal travel history indicates, in association with a selected behavior, the first parameter set which shows a travel environment at the time when the behavior is selected, and a second parameter set which shows a travel environment at the time when the behavior is displayed as a candidate. In other words, the second parameter set indicates a travel environment before the travel environment indicated by the first parameter. Notably, the first parameter set shows a travel environment when the behavior is selected, and also shows a travel environment when the behavior is executed. That is, there is no significant difference between the travel environment at the time when the behavior is selected and the travel environment at the time when the behavior is executed.

In this case, modeling unit 1002 models the numerical values of the environmental parameters included in the first parameter set and the numerical values of the environmental parameters included in the second parameter set which are indicated by the personal travel histories of at least one or more drivers described above, thereby constructing a driver model indicating a relationship between a vehicle behavior and the first or second parameter set of the vehicles of at least one or more drivers described above. Behavior estimating unit 1004 then estimates a behavior associated with the first parameter set or the second parameter set similar to the parameter set acquired by environment acquisition unit 1003 in the constructed driver model as a behavior of the vehicle driven by the estimation target driver.

The timing at which a behavior candidate is displayed (display timing) is before the timing at which a behavior is selected or executed (selection timing). Also, the travel environment may differ between at the display timing and at the selection timing. At the display timing, a travel environment at that timing can be acquired, but a travel environment at the subsequent selection timing cannot be acquired. Further, it is desirable to estimate a behavior at the display timing.

In view of this, modeling unit 1002 constructs the driver model indicating a relationship among the first parameter set which shows a travel environment at the selection timing, the second parameter set which shows a travel environment at the display timing, and the selected behavior. Further, the parameter set acquired by environment acquisition unit 1003 may be a parameter set at the display timing or a parameter set at the selection timing which is predicted from the parameter set at the display timing through extrapolation. Therefore, when the parameter set acquired by environment acquisition unit 1003 is the parameter set at the display timing, behavior estimating unit 1004 estimates a behavior associated with the second parameter set similar to the parameter set as a behavior of the vehicle driven by the estimation target driver. Thus, a more suitable behavior (that is, driving behavior) can be estimated in advance. On the other hand, when the parameter set acquired by environment acquisition unit 1003 is the parameter set at the selection timing, behavior estimating unit 1004 estimates a behavior associated with the first parameter set similar to the parameter set as a behavior of the vehicle driven by the estimation target driver. Thus, a more suitable behavior (that is, driving behavior) can be estimated in advance, that is, at the display timing.

In this case, behavior estimating unit 1004 may preferentially estimate a behavior associated with the first parameter set similar to the parameter set acquired by environment acquisition unit 1003 in the constructed driver model as a behavior of the vehicle driven by the estimation target driver.

Thus, the process for estimating a behavior can be appropriately performed.

The personal travel history may indicate traveling with one or more kinds of vehicle speeds as one or more behaviors as shown in FIG. 37. In this case, as shown in FIG. 33, environment acquisition unit 1003 acquires, as a parameter set, a travel environment of the vehicle which is driven by the estimation target driver and which is continuously traveling with an acceleration rate falling within a predetermined range including zero for only a first period. Such a travel state is regarded as a constant-speed travel state. The first period is T1 second shown in FIG. 33, for example. Behavior estimating unit 1004 then estimates traveling at a vehicle speed associated with a first parameter set similar to the parameter set acquired by environment acquisition unit 1003 in the constructed driver model as a behavior of the vehicle driven by the estimation target driver. Information processing system 1000 is also provided with vehicle controller 1006 that controls the vehicle such that the vehicle travels at the vehicle speed estimated by behavior estimating unit 1004.

Thus, the configuration described above enables the vehicle to travel at a vehicle speed according to a travel environment and suitable for the driver.

The personal travel history may also indicate traveling with one or more kinds of inter-vehicular distances as one or more behaviors as shown in FIG. 37. In this case, as shown in FIG. 34, environment acquisition unit 1003 acquires, as a parameter set, a travel environment of the vehicle, which is driven by the estimation target driver and which is traveling such that a state where an amount of changes inter-vehicular distance change [m/s]) in the distance between the vehicle and the nearby vehicle per unit time falls within a predetermined range including zero continues for a second period. Note that the second period is T2 second shown in FIG. 34, for example. Behavior estimating unit 1004 then estimates traveling with an inter-vehicular distance associated a first parameter set similar to the parameter set acquired by environment acquisition unit 1003 in the constructed driver model as a behavior of the vehicle driven by the estimation target driver. Vehicle controller 1006 controls the vehicle driven by the estimation target driver such that the vehicle travels while keeping the inter vehicular distance estimated by behavior estimating unit 1004.

Thus, the configuration described above enables the vehicle to travel while keeping an inter-vehicular distance according to the travel environment and suitable for the driver.

The personal travel history may also indicate traveling with one or more kinds of acceleration rate patterns (for example, the acceleration rate patterns shown in FIG. 36) as one or more behaviors. In this case, as shown in FIG. 35, environment acquisition unit 1003 acquires, as a parameter set, a travel environment of the vehicle at a point corresponding to a period from the time when an absolute value of an acceleration rate of the vehicle driven by the estimation target driver exceeds a first threshold until the absolute value of the acceleration rate becomes less than or equal to a second threshold lower than the first threshold. For example, the first threshold is acceleration rate threshold A3 in FIG. 35, and the second threshold is acceleration rate threshold A4 in FIG. 35. The point corresponding to the above-mentioned period is the point T3 second before this period in FIG. 35. Behavior estimating unit 1004 then estimates traveling with an acceleration rate pattern associated with a first parameter set similar to the parameter set acquired by environment acquisition unit 1003 in the constructed driver model as a behavior of the vehicle driven by the estimation target driver. Vehicle controller 1006 controls the vehicle driven by the estimation target driver such that the vehicle travels with the acceleration rate pattern estimated by behavior estimating unit 1004.

Thus, the configuration described above enables the vehicle to travel with an acceleration rate pattern according to the travel environment and suitable for the driver. In the example described above, traveling is represented by using an acceleration rate pattern. However, traveling may be represented by using an average acceleration rate.

The personal travel history may also indicate traveling with a steering angle pattern (for example, a steering angle pattern shown in FIG. 40) upon a lane change or right/left turn as one or more behaviors. In this case, as shown in FIG. 41, environment acquisition unit 1003 acquires, as a parameter set, a travel environment of the vehicle driven by the estimation target driver at a point corresponding to a period from the time when an absolute value of a steering angle of the vehicle exceeds a first threshold until it becomes zero. For example, the first threshold is steering angle threshold A5 in FIG. 41. Behavior estimating unit 1004 estimates traveling with a steering angle pattern associated with a first parameter set similar to the parameter set acquired by environment acquisition unit 1003 in the constructed driver model as a behavior of the vehicle driven by the estimation target driver. Vehicle controller 1006 controls the vehicle driven by the estimation target driver such that the vehicle travels with the steering angle pattern estimated by behavior estimating unit 1004.

Thus, the configuration described above enables the vehicle to travel with a steering angle pattern according to the travel environment and suitable for the driver. In the example described above, traveling is represented by using a steering angle pattern. However, traveling may be represented by using a maximum steering angle and a maximum angular velocity of the steering angle.

Information processing system 1000 may also be provided with characteristic acquisition unit 1007. Characteristic acquisition unit 1007 acquires a driving characteristic including a personal driving characteristic of each of a plurality of drivers. As shown in FIG. 22, for example, the personal driving characteristic indicates, in association with each other one or a plurality of behaviors of a vehicle executed by a driving operation performed by the driver and a characteristic amount in the driving operation of the vehicle performed for executing the one or each of the plurality of behaviors. For example, the characteristic amount may be a speed of the vehicle or an operation amount of the steering wheel, brake, and accelerator. In this case, modeling unit 1002 further models the personal driving characteristics of at least one or more drivers in the driving characteristic, thereby constructing a driving characteristic model indicating a relationship between a behavior and a characteristic amount of the vehicles of at least one or more drivers. Note that, similar to the driver model, the driving characteristic model may be of a clustering type or an individually-adapted type. When the one or any of the plurality of behaviors is selected by the driver or estimated by behavior estimating unit 1004 as the behavior to be executed, vehicle controller 1006 controls the behavior of the vehicle driven by the estimation target driver according to the characteristic amount associated with the behavior to be executed in the constructed driving characteristic model. For example, when a behavior of “lane change” is estimated for driver x in a state of having no fellow passenger, vehicle controller 1006 controls the vehicle behavior of “lane change” according to the characteristic amounts such as “8” for the speed, “4” for the steering wheel, “6” for the brake, and “8” for the accelerator, as shown in FIG. 22.

Accordingly; the behavior of the vehicle of the driver is performed according to the driving characteristic, that is, driving tendency of the driver, whereby a driving behavior more suitable for the driver can be executed.

Notably, a vehicle characteristic model can also be constructed at that time.

FIG. 42 is a diagram illustrating a configuration of an information processing system for constructing a vehicle characteristic model. FIG. 43 is a diagram showing vehicle characteristics.

Specifically, an effect on the vehicle behavior due to a depressing amount of the brake and accelerator greatly differs for each vehicle. The estimation of such an amount can implement smooth vehicle control. For example, an amount of depression of the brake and a travel environment of the vehicle are acquired as a parameter set together with the acceleration rate when the brake is depressed. The parameter set herein includes a vehicle type ID, vehicle speed, road surface condition (the slipperiness of the road is represented by numerical values in stages), gradient, wind speed (wind speed relative to the advancing direction of the host vehicle), and a total load weight (including occupants), for example. Characteristic acquisition unit 1007 a acquires an individual vehicle characteristic of each of a plurality of vehicles. The vehicle characteristic including the individual vehicle characteristics is the one shown in FIG. 43, for example. The vehicle characteristic indicates, for each vehicle ID, a situation description parameter (characteristic amount) of the vehicle having the vehicle ID and the amount of depression (behavior) when the vehicle travels with the situation description parameter, in association with each other.

Modelling unit 1002 models the individual vehicle characteristics of at least one or more vehicles in the vehicle characteristic, thereby constructing a vehicle characteristic model indicating a relationship between an amount of depression and a situation description parameter of the at least one or more vehicles. Behavior estimating unit 1004 estimates an amount of depression of the brake as a behavior of the vehicle to be estimated by using the vehicle characteristic model in the manner same as the manner of using the driver model. Specifically, behavior estimating unit 1004 estimates an amount of depression of the brake associated with a first parameter set similar to the parameter set acquired by environment acquisition unit 1003 and the acceleration rate estimated based on the driving characteristic in the constructed vehicle characteristic model as a behavior of the vehicle to be estimated. Vehicle controller 1006 controls the vehicle according the amount of depression of the brake estimated by behavior estimating unit 1004. The similar control can be applied for the accelerator.

Thus, the vehicle performs a behavior according to the prediction based on the vehicle characteristic, whereby the vehicle control can be smoothly performed.

Information processing system 1000 may also be provided with notification unit 1008 that notifies the estimation target driver of a behavior estimated by behavior estimating unit 1004 before this behavior is executed. Note that notification unit 1008 may be notification unit 92 in FIG. 1.

According to this configuration, notification regarding the estimated behavior is provided, whereby the driver can easily recognize in advance what behavior is to be executed, and thus, the driver's anxiety can be removed.

It should be noted that all of or some of environment acquisition unit 1003, behavior estimating unit 1004, display unit 1005, vehicle controller 1006, and notification unit 1008 may be provided to the vehicle driven by the estimation target driver or provided outside the vehicle. Similarly, all of or some of history acquisition unit 1001, modeling unit 1002, and characteristic acquisition unit 1007 may be provided to the vehicle driven by the estimation target driver or provided outside the vehicle. When some of the components included in information processing system 1000 are provided to the vehicle and the other components are provided outside of the vehicle, the components outside and inside the vehicle communicate with one another through a network, for example, to execute the respective processes described above.

Further, vehicle controller 1006 may be vehicle controller 7 in FIG. 1. Moreover, history acquisition unit 1001, characteristic acquisition unit 1007, modeling unit 1002, and behavior estimating unit 1004 may be included in vehicle controller 7 illustrated in FIG. 1.

Further, the personal travel history and the personal driving characteristic are generated by vehicle controller 1006 in each vehicle, for example. Vehicle controller 1006 may generate and accumulate the personal travel history or the personal driving characteristic during autonomous driving, or during manual driving.

FIG. 44 is a flowchart illustrating an information processing method according to one exemplary embodiment of the present invention.

The information processing method according to the fourth and fifth exemplary embodiment of the present invention includes step S1001 and step S1002.

In step S1001, a travel history is acquired which includes a personal travel history of each of a plurality of drivers, wherein each personal travel history indicates, in association with each other, one or a plurality of vehicle behaviors selected by the driver and a travel environment of the vehicle when the one or each of the plurality of behaviors is selected.

In step S1002, the personal travel histories of at least one or more drivers in the travel history are modeled, whereby a driver model indicating a relationship between a behavior and a travel environment of the vehicles of the at least one or more drivers is constructed.

Thus, a behavior of the vehicle driven by the estimation target driver is estimated by using the driver model, whereby even if the personal travel history of the estimation target driver is insufficient for behavior estimation, a behavior of the vehicle driven by the driver can be appropriately estimated. That is, a driving behavior suitable for the driver can be estimated.

First Modification of Fourth and Fifth Exemplary Embodiments

In the fourth and fifth exemplary embodiments, a vehicle behavior performed by a driver (driving behavior) is estimated, and the vehicle is controlled such that the estimated behavior is executed. On the other hand, the present modification is characterized in that, during manual driving, for example, a dangerous behavior of the vehicle of the driver is estimated, and a warning is issued to the driver so as to inhibit the execution of the dangerous behavior.

FIG. 45 is a diagram illustrating a configuration of an information processing system according to the present modification.

Similar to information processing system 1000 described above, information processing system 1100 according to the present modification is provided with history acquisition unit 1001, modeling unit 1002, environment acquisition unit 1003, and behavior estimating unit 1004. Information processing system 1100 is also provided with danger determination unit 1010, dangerous history acquisition unit 1011, travel history storage unit 1012, dangerous travel history storage unit 1013, and warning processor 1016.

Danger determination unit 1010 acquires a behavior of the vehicle selected by the driver together with a travel environment of the vehicle at the time when the behavior is selected, and determines whether or not the selected behavior is dangerous based on a predetermined determination reference. When being provided to the vehicle, danger determination unit 1010 acquires not only the behavior and the travel environment of the vehicle but also a behavior and a travel environment of the nearby vehicle, and determines whether or not the behavior of the nearby vehicle is dangerous. Specifically, danger determination unit 1010 acquires, for each of a plurality of drivers, a behavior of the vehicle selected by the driver together with a travel environment of the vehicle at the time when the behavior is selected, and determines whether or not the selected behavior is dangerous based on a predetermined determination reference. Danger determination unit 1010 retains a rule base as the predetermined determination reference. This rule base indicates whether each of a plurality of kinds of behaviors is dangerous or not.

When determining that the behavior is not dangerous, danger determination unit 1010 outputs information including the behavior and the travel environment as personal travel information. On the other hand, when determining that the behavior is dangerous, danger determination unit 1010 outputs information including the behavior and the travel environment as personal dangerous-travel information.

History acquisition unit 1001 acquires, for each of a plurality of drivers, an information group consisting of a plurality of personal travel information items output from danger determination unit 1010 as the personal travel history of the driver. History acquisition unit 1001 then stores a travel history including the personal travel histories of the plurality of drivers into travel history storage unit 1012.

Dangerous history acquisition unit 1011 acquires, for each of a plurality of drivers, an information group consisting of a plurality of personal dangerous-travel information items output from danger determination unit 1010 as the personal dangerous travel history of the driver. Dangerous history acquisition unit 1011 then stores a dangerous travel history including the personal dangerous travel histories of the plurality of drivers into dangerous travel history storage unit 1013.

Modeling unit 1002 constructs not only a driver model using the above-mentioned travel history, but also a danger driver model using the above-mentioned dangerous travel history. Specifically, modeling unit 1002 models the personal dangerous travel histories of at least one or more drivers in the dangerous travel history, thereby constructing a danger driver model indicating a relationship between a dangerous behavior and a travel environment of the at least one or more vehicles. Similar to the driver model, the danger driver model may be of a clustering type or an individually-adapted type.

Warning processor 1016 estimates a dangerous behavior associated with the travel environment acquired by environment acquisition unit 1003 in the constructed driver model as a behavior of the vehicle driven by the estimation target driver. Then, warning processor 1016 executes a process for issuing a warning regarding the estimated dangerous behavior to the driver. Notification unit 1008 issues a warning to the driver according to the process of warning processor 1016.

FIG. 46 is a diagram showing one example of a dangerous travel history stored in dangerous travel history storage unit 1013.

For example, the dangerous travel history indicates, for each driver ID for identifying a driver, the driver ID, a travel environment of the vehicle driven by the driver indicated by the driver ID, and a dangerous behavior (that is, risk) selected under the travel environment. In addition, the travel environment includes environmental parameters such as a vehicle speed (km/h), an inter-vehicular distance (m) with a preceding vehicle, a relative change rate of a preceding vehicle, an inter-vehicular distance (m) with a preceding vehicle on the left side, and a relative change rate of a preceding vehicle on the left side, for example. The relative change rate of a preceding vehicle is a rate of change of the head-to-head spacing between the host vehicle and the preceding vehicle, and the relative change rate of a preceding vehicle on the left side is a rate of change of the head-to-head spacing between the host vehicle and the preceding vehicle on the left side. Further, the risk includes rear-end collision, lane departure, and minor collision with a following vehicle on the right side, for example.

When a driver having a personal dangerous travel history similar to that of the estimation target driver has previously performed dangerous driving, and the travel environment during the dangerous driving is acquired by the vehicle driven by the estimation target driver, information processing system 1100 described above issues a warning according to the content of the risk.

For example, when a travel environment having a high possibility of colliding with a preceding vehicle is acquired by environment acquisition unit 1003, warning processor 1016 estimates rear-end collision as a dangerous behavior. Specifically, this travel environment indicates a distance between the vehicles and a timing of depressing a brake. If the driver having a personal dangerous travel history similar to that of the estimation target driver has previously had rear-end collision under the travel environment, warning processor 1016 determines that a possibility of rear-end collision is high under the travel environment. Warning processor 1016 then displays a warning message for prompting the driver to depress the brake earlier on notification unit 1008 provided as a HUD, for example.

When a travel environment having a high possibility of lane departure is acquired by environment acquisition unit 1003, warning processor 1016 estimates lane departure as a dangerous behavior. Specifically, this travel environment indicates a vehicle speed, an operation amount (steering angle) of a steering wheel upon braking, a lane width, and a curvature of a curved section of the road on which the vehicle is traveling. If the driver having a personal dangerous travel history similar to that of the estimation target driver has previously experienced lane departure under the travel environment due to a failure to navigate a curve, for example, warning processor 1016 determines that a possibility of lane departure is high under the travel environment. Warning processor 1016 then displays a warning message for prompting the driver to reduce the speed of the vehicle on notification unit 1008 provided as a HUD, for example. In this case, warning processor 1016 may display a desired operation amount (steering angle) of the steering wheel or a travel line on notification unit 1008.

When a travel environment having a high possibility of minor collision with the nearby vehicle due to a lane change is acquired by environment acquisition unit 1003, warning processor 1016 estimates minor collision as a dangerous behavior. Specifically, this travel environment indicates a distance between the host vehicle and a following vehicle on the right side, for example. If the driver having a personal dangerous travel history similar to that of the estimation target driver has previously had minor collision with a following vehicle on the right side under the travel environment, warning processor 1016 determines that a possibility of minor collision with a following vehicle on the right side is high under the travel environment. Warning processor 1016 then displays a warning message for notifying the driver of an approach of the following; vehicle on the right side on notification unit 1008 provided as a HUD, for example.

When a travel environment having a high possibility of minor collision with an obstacle such as a pedestrian is acquired by environment acquisition unit 1003, warning processor 1016 estimates minor collision as a dangerous behavior. Specifically, this travel environment indicates a distance between the host vehicle and the obstacle, for example. If the driver having a personal dangerous travel history similar to that of the estimation target driver has previously had minor collision with an obstacle (or has urgently avoided minor collision) under the travel environment, warning processor 1016 determines that a possibility of minor collision with the obstacle is high under the travel environment. Warning processor 1016 then displays a warning message for calling attention to an obstacle on notification unit 1008 provided as a HUD, for example.

When a travel environment having a high possibility of an accident while turning right or left is acquired by environment acquisition unit 1003, warning processor 1016 estimates an accident while turning as a dangerous behavior. Specifically, this travel environment indicates a spot where the vehicle is traveling (specifically, an intersection), and a distance between the host vehicle at an obstacle, for example. If the driver having a personal dangerous travel history similar to that of the estimation target driver has previously had an accident while turning under the travel environment, warning processor 1016 determines that a possibility of an accident while turning is high under the travel environment. Warning processor 1016 then displays a warning message for avoiding an accident while turning on notification unit 1008 provided HUD, for example.

As described above, according to the present modification, when the estimation target driver performs manual driving, for example, a warning for avoiding a dangerous behavior such as rear-end collision or lane departure an be provided to the driver, whereby the occurrence of the dangerous behavior can be suppressed.

Second Modification of Fourth and Fifth Exemplary Embodiments

In the fourth and fifth exemplary embodiments, a vehicle behavior performed by a driver (driving behavior) is estimated, and the vehicle is controlled such that the estimated behavior is executed. On the other hand, the present modification is characterized in that an ideal driving behavior is estimated, and the estimated driving behavior (that is, behavior of the vehicle) is recommended (specifically, displayed).

FIG. 47 is a diagram illustrating a configuration of an information processing system according to the present modification.

Similar to information processing system 1000 described above, information processing system 1200 according to the present modification is provided with history acquisition unit 1201, modeling unit 1202, environment acquisition unit 1203, behavior estimating unit 1204, and display unit 1208. Information processing system 1200 is also provided with driving behavior history storage unit 1212, ideal behavior driver model storage unit 1215, and model driving behavior history storage unit 1217. Environment acquisition unit 1203 has a function similar to the function of environment acquisition unit 1003 described above, and acquires a travel environment (also referred to as a driving environment) of a vehicle provided with environment acquisition unit 1203. History acquisition unit 1201 generates personal driving behavior information using the behavior of the vehicle and the travel environment of the vehicle acquired by environment acquisition unit 1203. The personal driving behavior information indicates a plurality of travel environmental parameters, each showing a travel environment, and behaviors performed for the plurality of travel environmental parameters, in association with each other. The travel environmental parameters include a speed of the vehicle, an inter-vehicular distance with a preceding vehicle, or a relative change rate of the preceding vehicle. Driving behavior history storage unit 1212 holds a plurality of personal driving behavior information items generated by history acquisition unit 1201. The plurality of personal driving behavior information items constitutes a driving behavior history.

Model driving behavior history storage unit 1217 holds a plurality of model driver driving behavior information items acquired through driving performed by a plurality of model drivers. The model driver driving behavior information is personal driving behavior information of a model driver. A plurality of model driver driving behavior information items obtained from one model driver, from among the plurality of model driver driving behavior information items, constitutes the model driving behavior history of the model driver. That is, model driving behavior history storage unit 1217 holds model driving behavior histories of a plurality of model drivers.

Modeling unit 1202 constructs an ideal behavior driver model using the driving behavior histories serving as a model (that is, model driving behavior histories) stored in model driving behavior history storage unit 1217. There are various types of model drivers, some performing more safety driving, and some joining the flow of nearby vehicles. Therefore, an ideal driver differs for each person. In view of this, modeling unit 1202 models the model driving behavior histories of at least one or more model drivers from among a plurality of model driving behavior histories stored in model driving behavior history storage unit 1217. Thus, modeling unit 1202 constructs an ideal behavior driver model indicating a relationship between an ideal behavior and a travel environment of the at least one or more model drivers. Similar to the driver model described above, the ideal behavior driver model may be of a clustering type or an individually-adapted type. Specifically, modeling unit 1202 obtains correlation between a frequency distribution of the driving behavior history of a certain driver and a frequency distribution of the model driving behavior history of each model driver, and constructs an ideal behavior driver model of the driver using the model driving behavior history of one or more model drivers having a similar frequency distribution.

Ideal behavior driver model storage unit 1215 holds the ideal behavior driver model constructed by modeling unit 1202.

Behavior estimating unit 1204 estimates a behavior associated with the travel environment acquired by environment acquisition unit 1203 in the constructed ideal behavior driver model as an ideal behavior of the vehicle driven by the driver. Display unit 1208 displays and recommends the estimated ideal behavior. For example, when lane change is estimated as an ideal behavior by behavior estimating unit 1204, display unit 1208 displays symbol 235 in FIG. 23 in a highlighted manner. For example, display unit 1208 highlights symbol 235 by changing the color of symbol 235.

FIG. 48 is a diagram showing one example of a model driving behavior history stored in model driving behavior history storage unit 1217.

For example, the model driving behavior history indicates a model driver ID for identifying a model driver, a travel environment of the vehicle driven by the model driver indicated by the model driver ID, and a behavior selected under the travel environment. In addition, the travel environment includes travel environmental parameters such as a vehicle speed (km/h), an inter-vehicular distance (m) with a preceding vehicle, a relative change rate of a preceding vehicle, an inter-vehicular distance (m) with a preceding vehicle on the left side, and a relative change rate of a preceding vehicle on the left side, for example. The relative change rate of a preceding vehicle is a rate of change of the head-to-head spacing between the host vehicle and the preceding vehicle, and the relative change rate of a preceding vehicle on the left side is a rate of change of the head-to-head spacing between the host vehicle and the preceding vehicle on the left side. The behavior includes lane change to the right lane, lane change to the left lane, acceleration, deceleration, and lane keeping.

Information processing system 1200 described above constructs an ideal behavior driver model serving as a model for an estimation target driver, and recommends an ideal driving behavior. As described above, in the present modification, when the estimation target driver performs autonomous driving, for example, the driver can select more ideal driving.

As described above, the processor in information processing system 1200 the present modification models driving behavior histories of at least one or more model drivers from among driving behavior histories of a plurality of model drivers, based on a degree of similarity between the driving behavior histories of the plurality of model drivers and the driving behavior history of the driver driving the vehicle. Thus, the processor constructs an ideal behavior driver model indicating a relationship between behaviors and travel environments of vehicles of at least one or more model drivers. Then, the processor estimates a behavior associated with the travel environment of the vehicle driven by the driver in the constructed ideal behavior driver model as a behavior of the vehicle. Note that the processor may be composed of a single processor or multiple processors.

With this configuration, an ideal behavior for the driver of the vehicle is estimated, and due to presentation of the ideal behavior, the driver can select the ideal driving.

Sixth Exemplary Embodiment

An information processing system in the present exemplary embodiment provides recommendation for bringing the vehicle driving performed by a driver closer to ideal driving.

FIG. 49 is a block diagram illustrating a configuration of the information processing system according to the present exemplary embodiment.

Information processing system 1300 in the present exemplary embodiment is provided with vehicle information acquisition unit 1301, sensor 1302, map information acquisition unit 1303, parameter generator 1304, model driving storage unit 1305, modeling unit. 1306, ideal state selector 1307, difference extractor 1308, recommendation determining unit 1309, and display unit 1310. Parameter generator 1304, modeling unit 1306, ideal state selector 1307, difference extractor 1308, and recommendation determining unit 1309 are achieved by at least one processor, for example. All of the components of information processing system 1300 may be provided in the vehicle to which recommendation is provided. Alternatively, some of the components of information processing system 1300 may be provided in the vehicle and the remaining components may be provided to a server that can communicate with the vehicle. For example, model driving storage unit 1305 may be provided to the server.

Vehicle information acquisition unit 3 has the functions of position information acquisition unit 61 and speed information acquisition unit 63 shown in FIG. 1, and acquires information such as the position of the vehicle, vehicle, speed, and steering angle.

Sensor 1302 corresponds to sensor 62 shown in FIG. 1. For example, sensor 1302 is a sensor used for advanced driver-assistance systems (ADAS), and is provided with at least one of a camera, a radar, and a distance measuring device.

Map information acquisition unit 1303 corresponds to map information acquisition unit 64 shown in FIG. 1, and acquires map information around the vehicle.

Parameter generator 1304 generates, as a vehicle parameter set, a parameter set having N (N is an integer of 2 or greater) driving environmental parameters in response to the outputs from vehicle information acquisition unit 1301, sensor 1302, and map information acquisition unit 1303. The driving environmental parameters include a vehicle speed, a steering angle, an inter-vehicular distance with a preceding vehicle, a lane width, and a speed limit, for example. Parameter generator 1304 may extract the lane width and speed limit from the map information, or derive them based on the detection result of sensor 1302. Parameter generator 1304 generates such a vehicle parameter set in real time (that is, sequentially). Such a vehicle parameter set indicates the current driving environment of the driver as a position of a point in an N-dimensional coordinate system.

Model driving storage unit 1305 holds, as a model driving environment database, a plurality of model driving environment information items acquired through driving performed by a plurality of model drivers. The model driving environment information indicates the driving environment through driving by the model driver as N driving environmental parameters. The plurality of model driving environment information items includes not only a plurality of model driving environment information items obtained from one model driver but also model driving environment information items of other model drivers.

Note that the model driver may be a professional driver. The model driving environment database may be constituted by a plurality of driving environment information items obtained through driving of many and unspecified drivers without using a plurality of model driving environment information items obtained through driving by a model driver. In such a case, a plurality of driving environment information items having less variation in an acceleration rate is extracted from the plurality of driving environment information items of many and unspecified drivers, and the model driving environment database is constructed based on the extracted driving environment information items.

Modeling unit 1306 constructs the ideal driving driver model using the model driving environment database held in model driving storage unit 1305. For example, modeling unit 1306 models the ideal driving environment (that is, driving) by performing linear regression analysis of a mixture distribution model on the model driving environment database. As a result, the abovementioned ideal driving driver model is constructed. The ideal driving driver model thus constructed indicates an effective ideal driving range as a region in the N-dimensional coordinate system. Each point included in the region represents an ideal driving environment by N driving environmental parameters (that is, a parameter set) defining the position of the point. In other words, the ideal driving driver model indicates a plurality of parameter sets included in the region of the ideal driving environment.

Ideal state selector 1307 selects, as an ideal parameter set, a parameter set similar to the vehicle parameter set generated by parameter generator 1304, from among a plurality of parameter sets indicated by the ideal driving driver model. That is, ideal state selector 1307 selects a point closer to the point indicating the driver's current driving environment within the region indicated by the ideal driving driver model in the N-dimensional coordinate system.

Specifically, ideal state selector 1307 extracts, from among a plurality of parameter sets indicated by the ideal driving driver model, a plurality of parameter sets in which a specific driving environmental parameter has substantially the same value as that in the vehicle parameter set. The specific driving environmental parameter is a parameter which indicates a road condition such as a lane width and speed limit, and which cannot be changed by driving performed by the driver. That is, ideal state selector 1307 extracts, from among a plurality of parameter sets indicated by the ideal driving driver model, a plurality of parameter sets which is equal to the vehicle parameter set in the lane width and the speed limit. Ideal state selector 1307 then selects, from among the extracted parameter sets, a parameter set similar to the vehicle parameter set as an ideal parameter set.

Difference extractor 1308 calculates a difference between the vehicle parameter set generated by parameter generator 1304 and the ideal parameter set selected by ideal state selector 1307.

Recommendation determining unit 1309 determines, as recommendation information, information for recommending that the driver of the vehicle changes a driving operation amount which is at least one of a steering angle and a depression amount of the brake or accelerator. Specifically, recommendation determining unit 1309 specifies a driving operation amount for reducing the difference calculated by difference extractor 1308, and determines recommendation information indicating the current driving operation amount and the specified driving operation amount. Recommendation determining unit 1309 then displays the determined recommendation information on display unit 1310.

Display unit 1310 is a display or a head-up display composed of liquid crystals or an organic EL.

FIG. 50 is a diagram showing one example of content of the model driving environment database stored in model driving storage unit 1305.

For example, the model driving environment database indicates, for each model driver ID for identifying a model driver, the model driver ID and a driving environment of the vehicle driven by the model driver indicated by the model driver ID. In addition the driving environment includes driving environmental parameters such as a vehicle speed (km/h), an inter-vehicular distance (m) with a preceding vehicle, a relative change rate of a preceding vehicle, an inter-vehicular distance (m) with a preceding vehicle on the left side, a relative change rate of a preceding vehicle on the left side, a lane width, and a speed limit, for example. Note that the relative change rate of the preceding vehicle is a rate of change of the head-to-head spacing between the host vehicle and the preceding vehicle, that is, the speed of the host vehicle relative to the preceding vehicle. Similarly, the relative change rate of the preceding vehicle on the left side is a rate of change of the head-to-head spacing between the host vehicle and the preceding vehicle on the left side, that is, the speed of the host vehicle relative to the preceding vehicle on the left side.

FIG. 51 is a diagram showing one example of a relationship between an ideal driving environment region and a driving environment of the vehicle.

For example, the parameter set includes a vehicle speed and a steering angle as the driving environmental parameter and the abovementioned specific driving environmental parameter. The specific driving environmental parameter indicates a road condition such as a lane width and a speed limit. In this case, ideal state selector 1307 selects, from the region indicated by the ideal driving driver model in the N-dimensional coordinate system, a certain region having specific driving environmental parameters which are substantially equal to the specific driving environmental parameters included in the host vehicle parameter set. Specifically, the region in the N-dimensional coordinate system is narrowed to a certain region indicating a road condition similar to the road condition represented by the host vehicle parameter set.

The parameter set may include, except for the specific driving environmental parameters, driving environmental parameters other than the vehicle speed and the steering angle. In such a case, ideal state selector 1307 selects, from the region the N-dimensional coordinate system, a certain region having driving environmental parameters which are substantially equal to the respective driving environmental parameters other than the vehicle speed and the steer angle included in the host vehicle parameter set.

Ideal state selector 1307 then maps the selected region in the two-dimensional coordinate system represented by the steering angle axis and the vehicle speed axis as shown in FIG. 51. Due to such mapping, region M where ideal driving (that is, driving environment) is concentrated is formed in the two-dimensional coordinate system. The driving environmental parameters other than the vehicle speed and the steering angle are the same at the respective points in such region M.

Ideal state selector 1307 further plots a point indicating the current vehicle driving environment in the two-dimensional coordinate system represented by the steering angle and the vehicle speed included in the host vehicle parameter set which is generated by parameter generator 1304.

For example, ideal state selector 1307 plots point A indicating the current vehicle driving environment in the two-dimensional coordinate system. When point A is outside region M, ideal state selector 1307 selects a point close to point A from among a plurality of points within region M. For example, ideal state selector 1307 selects a point closest to point A in the direction along the steering angle axis. When the point is selected in this way, difference extractor 1308 calculates the difference between point A and the selected point, that is, the difference between steering angles. Recommendation determining unit 1309 determines the current steering angle and the steering angle which is larger or smaller than the current steering angle by the calculated difference as recommendation information.

Alternatively, ideal state selector 1307 plots point B indicating the current vehicle driving environment in the two-dimensional coordinate system. When point B is outside region M, ideal state selector 1307 selects a point close to point B from among a plurality of points within region M. For example, ideal state selector 1307 selects a point closest to point B in the direction along the vehicle speed axis. When the point is selected in this way, difference extractor 1308 calculates the difference between point 13 and the selected point, that is, the difference between vehicle speeds. Recommendation determining unit 1309 specifies a driving amount for decreasing the difference between vehicle speeds. In other words, recommendation determining unit 1309 specifies a larger depression amount (depression amount of the accelerator or the brake as the difference is larger. Recommendation determining unit 1309 then determines the recommendation information indicating the current depression amount and the specified depression amount. In the example shown in FIG. 51, recommendation determining unit 1309 determines the recommendation information indicating a larger depression amount of the accelerator (that is, acceleration) as the specified depression amount.

FIG. 52 is a view showing one example of the recommendation information to be displayed on display unit 1310.

When display unit 1310 is provided as a head-up display, it projects the recommendation information in HUD display region 1310A which is a part of the windshield of the vehicle. The recommendation information is composed of, for example, image 1312 a of the steering wheel which is rotated by the current steering angle and image 1312 b of the steering wheel which is rotated by an ideal steering angle. Alternatively, recommendation information is composed of, for example, image 1313 a showing the current depression amount of the accelerator or the brake and image 1313 b showing the depression amount specified in the manner described above as an ideal depression amount.

As described above, in the present exemplary embodiment, the recommendation information is displayed, whereby the driver can easily perform ideal driving using the recommendation information.

Summary of Sixth Exemplary Embodiment

As described above, the processor in information processing system 1300 in the present exemplary embodiment acquires a vehicle driving environment composed of N-dimensional (N is an integer of 2 or greater) parameters, and refers to an ideal driving driver model indicating an ideal driving environment region in an N-dimensional coordinate system. The processor then selects one ideal driving environment included the ideal driving environment region based on a distance between the ideal driving environment region and the acquired vehicle driving environment in the N-dimensional coordinate system. The processor then displays, on a display, recommendation information for bringing the vehicle driving environment closer to the specified ideal driving environment.

For example, the N-dimensional parameters include at least one of a vehicle speed, a steering angle, an inter-vehicular distance, and a relative speed, as a parameter.

FIG. 53 is a flowchart showing an example of the information processing method according to the present exemplary embodiment.

First, the processor acquires the vehicle driving environment composed of N-dimensional (N is an integer of 2 or greater) parameters (step S1301). Then, the processor refers to the ideal driving driver model indicating the ideal driving environment region in the N-dimensional coordinate system (step S1302). The processor then selects one ideal driving environment included in the ideal driving environment region based on a distance between the ideal driving environment region and the acquired vehicle driving environment in the N-dimensional coordinate system (step S1303). The processor then displays, on a display, recommendation information for bringing the vehicle driving environment closer to the specified ideal driving environment (step S1304).

Thus, the recommendation information for bringing the vehicle driving environment closer to the ideal driving environment is displayed, whereby the driver can easily perform ideal driving sing the recommendation information.

When specifying the ideal driving environment, the processor may select an ideal driving environment having the shortest distance with the vehicle driving environment from the ideal driving environment region.

Thus, the driver can bring the driving environment closer to the ideal striving environment with an amount of change from the current driving environment of the vehicle being reduced, thereby being capable of more easily performing ideal driving.

When displaying the recommendation information, the processor may determine, as the recommendation information, information for recommending that the driver of the vehicle changes a driving operation amount which is at least one of a steering angle and a depression amount of the brake or accelerator. For example, the at least one processor further calculates a difference between the vehicle driving environment and the selected ideal driving environment, and when displaying the recommendation information specifies the driving operation amount for reducing the difference and determines the recommendation information indicating the current driving operation amount and the specified driving operation amount.

Thus, the driver can easily find the manner to change at least one of the steering angle and the depression amount of the accelerator or the brake for achieving ideal driving, based on the recommendation information.

Note that the processor may be composed of a single processor or multiple processors.

In addition, modeling unit 1306 may construct a plurality of ideal driving driver models. Ideal state selector 1307 may select, from among the ideal driving driver models, an ideal driving driver model having less acceleration and deceleration. Alternatively, ideal state selector 1307 may select an ideal driving driver model that elicits performance of the vehicle or an ideal driving driver model that ac sieves more safety driving.

Recommendation determining unit 1309 may recommend the behavior or driving characteristics estimated as in the fourth or fifth exemplary embodiment in display unit 1310.

In the present exemplary embodiment, mapping in the two-dimensional coordinate system having two axes, the vehicle speed axis and the steering angle axis, is conducted. However, axes representing other driving environmental parameters may be used as these axes. Further, mapping in the two-dimensional coordinate system may not be conducted. That is, ideal state selector 1307 selects, as the most optimum ideal driving environment for the vehicle, a point closest to the point indicating the vehicle driving environment from the region indicated by the ideal driving driver model in the N-dimensional coordinate system.

Modification of Sixth Exemplary Embodiment

As described above, there are various types of model drivers including model drivers who tend to move in a more safety region, model drivers performing stable driving at low speed, and model drives who join the flow of vehicles around his/her vehicle. In view of this, modeling unit 1202 models a plurality of model driving environment information items of the same type of model drivers in the model driving environment database. Thus, modeling unit 1202 constructs an ideal driving driver model indicating an ideal driving environment for the model driver of this type. Similar to the driver model described above, the ideal driving driver model may be of a clustering type or an individually-adapted type. When constructing a clustering type, modeling unit 1202 constructs several types of ideal driving driver models.

In the present modification, the ideal driving environments indicated by several types of ideal driving driver models and the current vehicle driving environment are displayed in a comparable manner.

FIG. 54 is a view illustrating an example of an image to be displayed on display unit 1310 in the present modification.

For example, the parameter set includes a vehicle speed and a steering angle as the driving environmental parameter and the abovementioned specific driving environmental parameter. In this case, ideal state selector 1307 forms, for each ideal driving driver model, a region where ideal driving (that is, driving environment) represented by the ideal driving driver model is concentrated in the two-dimensional coordinate system, in the same manner as described above.

As illustrated in FIG. 54, recommendation determining unit 1309 plots regions M1, M2, and M3 formed for the respective ideal driving driver models in the two dimensional coordinate system, and plots point A1 at the position represented by the vehicle speed and the steering angle of the host vehicle parameter set. Point A1 represents the vehicle current driving environment. Recommendation determining unit 1309 displays, on display unit 1310, an image where regions M1 to M3 and point A1 are plotted in the two-dimensional coordinate system. That is, display unit 1310 displays the image generated by recommendation determining unit 1309 in screen 1310B of a liquid crystal display for example, as illustrated in FIG. 54.

When displaying regions M1 to M3 on display unit 1310, recommendation determining unit 1309 may display, on display unit 1310, icons indicating types of ideal driving driver models corresponding to these regions. For example, icon M11 having, for example, an illustration of a turtle for indicating that the ideal driving driver model for region 1 is a type of low-speed and stable driving is displayed in region M1. Icon M21 having, for example, an illustration of a snake for indicating that the ideal driving driver model for region M2 is a type of moving to a more safety region is displayed in region M2. Icon M31 having, for example, an illustration of a rabbit for indicating that the ideal driving driver model for region M3 is a type of joining the flow of surrounding vehicles is displayed in region M3.

Recommendation determining unit 1309 also updates the image to be displayed on display unit 1310 in real time as needed. Thus, the driver of the vehicle can easily find how to adjust the steering angle and vehicle speed for bringing his/her driving closer to any types of ideal driving.

As described above, in the present modification, the processor further refers to a plurality of ideal driving driver models indicating ideal driving environment regions different from one another in the N-dimensional coordinate system. The processor then displays, on the display, the plurality of ideal driving environment regions different from one another and a point representing the vehicle driving environment.

Thus, the driver can easily find how to adjust parameters such as the steering angle and the vehicle speed for bringing the current driving environment closer to any types of ideal driving environment.

FIG. 55 is a view illustrating another example of an image to be displayed on display unit 1310 in the present modification.

For example, the driver of the vehicle decreases the steering angle of the steering wheel while traveling. Thus, the vehicle driving environment changes. When point A1 indicating the current vehicle driving environment is included within region M1 due to the change of the vehicle driving environment, recommendation determining unit 1309 outputs a signal indicating icon M11 to display unit 1310. When receiving this signal, display unit 1310 displays icon M11 indicating that ideal driving corresponding to region M1 is performed in HUD display region 1310A.

As described above, in the present modification, when the abovementioned point is located within any one of the ideal driving environment regions, the processor displays, on the display, an icon indicating that the vehicle driving environment is the ideal driving environment corresponding to the region.

Thus, the driver can easily find what type of ideal driving he/she performs.

Note that the processor may be composed of a single processor or multiple processors. Further, the present exemplary embodiment and the second modification of the fourth and fifth exemplary embodiments may be combined.

While the exemplary embodiments according to the present invention have been described above with reference to the drawings, the functions of the above-mentioned devices and processing units can be achieved by a computer program.

A computer that achieves the abovemetioned functions through the execution of the program is provided with an input device such as a keyboard, a mouse, and a touch pad, an output device such as a display and a speaker, a processor or a central processing unit (CPU), a storage device such as a read only memory (ROM), a random access memory (RAM), a hard disk device, and a solid state drive (SSD), a reading device that reads information from a recording medium such as a digital versatile disk read only memory (DVD-ROM) and a universal serial bus (USB) memory, and a network card that conducts communication through a network, and the respective elements are interconnected through a bus.

The reading device reads the program from the recording medium having the program recorded thereon, and the storage device stores the program. Alternatively, the network card communicates with a server device connected to the network, and a program downloaded from the server device for achieving the respective functions of the abovementioned devices is stored in the storage device.

Then, the processor or the CPU copies the program stored in the storage device on the RAM, sequentially reads commands included in the program from the RAM, and executes the read commands, whereby the functions of the respective devices are achieved.

INDUSTRIAL APPLICABILITY

The information processing system, information processing method, and program according to the present invention are applicable to a device or a system that processes information relating to driving of vehicles.

REFERENCE MARKS IN THE DRAWINGS

1: vehicle

2: brake pedal

3: accelerator pedal

4: indicator lever

5: steering wheel

6: detector

7, 1006: vehicle controller

8: storage unit

9: information notification device

10: touch panel.

29 a to 29 c, 29 g, 39 a to 39 c, 39 g, 59 a to 59 c, 59 g, 69 a, 69 c, 69 g, 79 a, 79 c, 79 g, 89 a to 89 c, 89 g, 99 b, 99 c, 99 g, 109 a to 109 d, 109 e, 109 g, 121, 121 a to 121 d: display region

51: operating unit

51 a to 51 h: operation button

59, 69, 79, 89, 99: character information

61: position information acquisition unit

62: sensor

63: speed information inquisition unit

64: map information acquisition unit

91: information acquisition unit

92, 1008: notification unit

101, 1005: display unit

102: input unit

109: display

111, 112, 113, 114, 121, 121′, 122, 122′, 123, 131, 131′, 132, 133, 134, 134′, 135 to 137, 231, 232, 233, 233′, 234, 234′, 235, 251, 251′, 252, 252′, 253, 261, 262, 263, 264, 265, 266, 267, 268: symbol.

281: autonomous driving controller

282: vehicle behavior detector

291: communication unit

292: cache

301: host vehicle

302: adjacent preceding vehicle

303: detected surrounding condition

304: primary cache

305: secondary cache

1000: information processing system

1001: history acquisition unit

1002: modeling unit

1003: environment acquisition unit

1004: behavior estimating unit

1007, 1007 a: characteristic acquisition unit

1010: danger determination unit

1011: dangerous history acquisition unit

1012: travel history storage unit.

1013: dangerous travel history storage

1016: warning processor

1100, 1200: information processing system

1201: history acquisition unit.

1202: modeling unit

1203: environment acquisition unit

1204: behavior estimating unit

1208: display unit

1212: driving behavior history storage unit

1215: ideal behavior driver model storage

1217: model driving behavior history storage unit

1300: information processing system

1301: vehicle information acquisition unit

1302: sensor

1303: map information acquisition unit

1304: parameter generator

1305: model driving storage unit

1306: modeling unit

1307: ideal state selector

1308: difference extractor

1309: recommendation determining unit

1310: display unit 

The invention claimed is:
 1. An information processing system, comprising: at least one processor, and a display, wherein the at least one processor, in operation: acquires a driving environment of a vehicle, the driving environment being composed of N-dimensional parameters and represented as a point in an N-dimensional coordinate system, where N is an integer of 3 or greater and the N-dimensional parameters include a vehicle speed parameter, a steering angle parameter, an inter-vehicular distance parameter, or a relative speed parameter; refers to an ideal driving driver model indicating an ideal driving environment region defined in the N-dimensional coordinate system; selects an ideal driving environment included in the ideal driving environment region based on a distance between the ideal driving environment region and the point representative of the acquired driving environment in the N-dimensional coordinate system; and outputs, on the display, recommendation information for bringing the driving environment of the vehicle closer to the selected ideal driving environment.
 2. The information processing system according to claim 1, wherein when selecting the ideal driving environment, the at least one processor selects an ideal driving environment having the shortest distance, to the point representative of the acquired driving environment, within the ideal driving environment region.
 3. The information processing system according to claim 1, wherein the recommendation information outputted on the display includes information for recommending that a driver of the vehicle changes a driving operation amount that is at least one of a steering angle, a depression amount of a brake, or a depression amount of an accelerator.
 4. The information processing system according to claim 3, wherein the at least one processor calculates a difference between the point representative of the acquired driving environment of the vehicle and the selected ideal driving environment, and determines the driving operation amount for reducing the difference, and the recommendation information outputted on the display indicates a current driving operation amount and the determined driving operation amount.
 5. The information processing system according to claim 1, wherein the at least one processor: refers to a plurality of the ideal driving driver models indicating ideal driving environment regions that are different from one another in the N-dimensional coordinate system; and outputs, on the display, the ideal driving environment regions that are different from one another and the point representative of the acquired driving environment of the vehicle.
 6. The information processing system according to claim 5, wherein when the point is located within a first region that is one of the ideal driving environment regions, the at least one processor outputs, on the display, an icon indicating that the driving environment of the vehicle is an ideal driving environment corresponding to the first region.
 7. The information processing system according to claim 1, wherein the at least one processor: models, based on a degree of similarity between driving behavior histories of a plurality of model drivers and a driving behavior history of a driver driving the vehicle, driving behavior histories of at least one or more model drivers from among the driving behavior histories of the plurality of model drivers, and constructs an ideal behavior driver model which correlates behaviors of vehicles driven by the at least one or more model drivers and travel environments; and estimates, as a behavior of the vehicle, a behavior associated with a travel environment of the vehicle driven by the driver in the constructed ideal behavior driver model.
 8. An information processing method, comprising: acquiring a driving environment of a vehicle, the driving environment being composed of N-dimensional parameters and represented as a point in an N-dimensional coordinate system, where N is an integer of 3 or greater and the N-dimensional parameters include a vehicle speed parameter, a steering angle parameter, an inter-vehicular distance parameter, or a relative speed parameter; referring to an ideal driving driver model indicating an ideal driving environment region defined in the N-dimensional coordinate system; selecting an ideal driving environment included in the ideal driving environment region based on a distance between the ideal driving environment region and the point representative of the acquired vehicle driving environment in the N-dimensional coordinate system; and displaying recommendation information for bringing the driving environment of the vehicle closer to the selected ideal driving environment.
 9. The information processing method according to claim 8, wherein the selecting includes selecting an ideal driving environment having the shortest distance, to the point representative of the acquired driving environment, within the ideal driving environment region.
 10. The information processing method according to claim 8, wherein the recommendation information includes information for recommending that a driver of the vehicle changes a driving operation amount that is at least one of a steering angle, a depression amount of a brake, or a depression amount of an accelerator.
 11. The information processing method according to claim 10, comprising: calculating a difference between the point representative of the acquired driving environment of the vehicle and the selected ideal driving environment; and determining the driving operation amount for reducing the difference; wherein, the recommendation information indicates a current driving operation amount and the determined driving operation amount.
 12. The information processing method according to claim 8, comprising: referring to a plurality of the ideal driving driver models indicating ideal driving environment regions that are different from one another in the N-dimensional coordinate system; and displaying the ideal driving environment regions that are different from one another and the point representative of the acquired driving environment of the vehicle.
 13. The information processing method according to claim 12, comprising: when the point is located within a first region that is one of the ideal driving environment regions, displaying an icon indicating that the driving environment of the vehicle is an ideal driving environment corresponding to the first region.
 14. A non-transitory machine-readable recording medium that stores a program that causes a computer to execute: acquiring a driving environment of a vehicle, the driving environment being composed of N-dimensional parameters and represented as a point in an N-dimensional coordinate system, where N is an integer of 3 or greater and the N-dimensional parameters include a vehicle speed parameter, a steering angle parameter, an inter-vehicular distance parameter, or a relative speed parameter; referring to an ideal driving driver model indicating an ideal driving environment region defined in the N-dimensional coordinate system; selecting an ideal driving environment included in the ideal driving environment region based on a distance between the ideal driving environment region and the point representative of the acquired vehicle driving environment in the N-dimensional coordinate system; and displaying recommendation information for bringing the driving environment of the vehicle closer to the selected ideal driving environment.
 15. The non-transitory machine-readable recording medium according to claim 14, wherein the selecting includes selecting an ideal driving environment having the shortest distance, to the point representative of the acquired driving environment, within the ideal driving environment region.
 16. The non-transitory machine-readable recording medium according to claim 14, wherein the recommendation information includes information for recommending that a driver of the vehicle changes a driving operation amount that is at least one of a steering angle, a depression amount of a brake, or a depression amount of an accelerator.
 17. The non-transitory machine-readable recording medium according to claim 16, wherein the program causes the computer to execute: calculating a difference between the point representative of the acquired driving environment of the vehicle and the selected ideal driving environment; and determining the driving operation amount for reducing the difference; wherein, the recommendation information indicates a current driving operation amount and the determined driving operation amount.
 18. The non-transitory machine-readable recording medium according to claim 14, wherein the program causes the computer to execute: referring to a plurality of the ideal driving driver models indicating ideal driving environment regions that are different from one another in the N-dimensional coordinate system; and displaying the ideal driving environment regions that are different from one another and the point representative of the acquired driving environment of the vehicle.
 19. The non-transitory machine-readable recording medium according to claim 18, wherein the program causes the computer to execute: when the point is located within a first region that is one of the ideal driving environment regions, displaying an icon indicating that the driving environment of the vehicle is an ideal driving environment corresponding to the first region.
 20. The non-transitory machine-readable recording medium according to claim 14, wherein the program causes the computer to execute: modeling, based on a degree of similarity between driving behavior histories of a plurality of model drivers and a driving behavior history of a driver driving the vehicle, driving behavior histories of at least one or more model drivers from among the driving behavior histories of the plurality of model drivers; constructing an ideal behavior driver model which correlates behaviors of vehicles driven by the at least one or more model drivers and travel environments; and estimating, as a behavior of the vehicle, a behavior associated with a travel environment of the vehicle driven by the driver in the constructed ideal behavior driver model. 